Here's a nice list:
Censorship
These are changes made in the anime for the young audience where originally in the source material, the content is unsuitable.
Part I
In the manga, when Mizuki throws multiple kunai at Iruka, Iruka pulls a kunai out of his chest.[1]
In the anime, none of the kunai hit his chest and he pulls a kunai out of his right leg instead.[2]
In the manga, Ebisu fixes his glasses with his middle finger.[3]
In the anime, he also uses his index finger.[4]
In the manga, during the bell test at the Third Training Ground, Sasuke unleashes a barrage of shuriken and kunai that directly impale Kakashi in the face which causes blood to spray out from a front angle.[5]
In the anime, he is pushed aside quickly and only the scene of him viewed from behind is left.[6]
During the bell test, Kakashi casts a genjutsu spell on Sakura, showing her a gravely injured Sasuke. In the manga, "Sasuke" has a missing left arm, a twisted left leg and numerous kunai impaling his body. In the anime, he only has a few kunai impaling his body.[7][8]
As a result of the genjutsu, Sakura is rendered unconscious on the ground. The manga played up the more intense and comical spaz attack by showing an unconscious Sakura with wide blank eyes and seizure-like foam at the mouth.[8][9]
In the manga, after the Demon Brothers capture and seemingly kill Kakashi, a silhouette of different body parts being shred apart is shown.[10]
In the anime, much of the blood and gore is removed.[11]
In the manga, when Kakashi is describing the role of hunter-nin a severed hand that is impaled with a knife is shown.[12] In the anime, this is removed.[13]
In the manga, in the flashback scene where Kaiza is crucified and then executed, his arms have also been chopped off.[14] In the anime, they are instead only badly broken and burned.[15]
In the anime, when Kakashi unintentionally killed Haku with his Lightning Cutter, his hand only pierced the front of Haku's chest.[16] However, in the manga, Kakashi's hand went right through his body, with his hand visibly coming out of Haku's back.[17]
In the manga, when Gatō arrives and sees Haku's corpse, he is seen kicking him across the face as payback for when Haku nearly broke his arm.[18] However in the anime, the kick to his face is not seen, and only Naruto's look of shock is seen instead.[19]
In the manga, Zabuza stabs Gatō in the chest and then decapitates Gatō to kill him,[20] while in the anime, Zabuza stabs Gatō in the chest and then instead slashes him multiple times across the chest, which results in Gatō falling off the bridge to his death.[21]
In the manga, when Anko Mitarashi threw a kunai at Naruto and cut his cheek, she licks the blood directly from Naruto's cheek.[22] In the anime, she only touches the blood from his cheek with her fingers.[23]
In the manga, when Gaara is about to kill Baiu and Midare, Temari says good bye to them and also waves good bye with a big smile on her face.[24] The anime removed this.[25]
In the manga, during the preliminary rounds of the Chūnin Exams, Zaku Abumi's right arm is blown off when Shino Aburame uses his bugs to block Zaku's air tubes.[26] In the anime, both of Zaku's arms remain attached to his body, only the skin on his arms break.
In the manga, when Gaara attacks and kills Dosu using the power of Shukaku, the attack bifurcated Dosu, which is seen when the dust cloud Gaara created had cleared up.[27] In the anime only Dosu's injured arm was shown after the fatal attack and unlike the manga Gaara is also seen using this attack directly.[28]
The design of the Hyūga Main Family's Juinjutsu is different in the manga and anime. In the manga, it was a variation of a manji,[29] a Buddhist symbol, but due to its similarity in appearance to the swastika, it was altered into an X in the anime to avoid confusion.[30]
In the manga, when Gaara brutally murdered Shiba and Midori (which was not shown in detail), the hallway was completely splattered with their blood and body parts, to which Gaara even stepped on.[31] The anime significantly reduced this by showing their murders in detail, but instead they were completely crushed within Gaara's sand, blood and bodies buried within it. Midori's attempt to escape before being dragged back in was exclusive to the anime as well.[32]
In the manga, when Kakashi defends Sakura against two Oto-nin, he impales them in the head with kunai.[33] In the anime, he slashes them across the chest with kunai instead.[34]
In the manga, after Asuma rescues Shikamaru from a group of Oto-nin, he slashes them and punches using his trench knives, leaving their bloody corpses to the floor, he then flicks his cigarette into a pool of their blood.[35] In the anime, the brutal assault was censored with Asuma only punching them with the trench knives and never slashing them or smoking a cigarette.[36]
In the manga, when Hiruzen Sarutobi raids Orochimaru's lair, there are several corpses strung along the walls.[37] In the anime, these corpses are replaced with shelves containing jars filled with remains and various organs.[38]
In the manga, when Gaara presses Sakura up against a tree, blood trickles out of her mouth.[39] In the anime, this is removed.[40]
In the manga, when a young Gaara attempted to cut himself in a flashback, he aimed for his wrist, at the vein.[41] In the anime, he aimed at the back of his hand instead.[40]
In the manga, when Kabuto goes for blood to summon snakes, he retrieves it from the wound on his wrist.[42] In the anime, he retrieves the blood from a wound on his palm instead.[43]
In the manga, when Naruto prevents Kabuto Yakushi from attacking Tsunade, Kabuto's kunai directly impales Naruto's hand.[44] In the anime, it gets caught between Naruto's fingers instead.[43]
In the manga, especially in Part I, Naruto and Kiba "flip the bird" several times,[45] in the English adaptation of the manga and in the anime they only close their fist and look angry.
In the manga, when Shikamaru Nara gets caught in Tayuya's genjutsu, he sees his skin and flesh melt off of his bones.[46] In the anime, he sees his entire arm melt away including the bones.[47]
In the manga, after Raidō Namiashi and Genma Shiranui are defeated by the Sound Four, Raidō has three shuriken in his back and Genma has two kunai in his chest with his left palm facing up.[48] In the anime, Raidō has two shuriken and a single kunai in his back and Genma has a single kunai in his chest with his left palm facing down.[49]
In the manga, while Kimimaro is fighting Gaara, Kimimaro's bones came out of his fingertips by dividing his skin on his fingertips.[50] In the anime, his bones just emerged from his fingertips through holes that close afterwards.[51]
Often in the manga, women are almost always shown naked (in spa baths or via Sexy Technique). Occasionally in the English adaptations of the manga and often in the anime, the women are covered by something (towels, fog, clouds, etc) when they're shown.
As Naruto walks through the festival city, he stops by a mask shop and purchases a mask. Various masks in the background represent past Japanese manga, anime and tv series "in-jokes" included by Kishimoto. These include masks of Kamen Rider and Chaozu from the Dragon Ball series. The anime changed many of these to generic masks.[52][53]
A minor edit concerning the location of the small shinobi animals, Gamatatsu, Gamakichi and Tonton are all in the thick of the action when the giant snakes begin to attack.[43][54]
Related to the previous entry, Tonton was among the injured fallen in the manga. In the anime, the three shinobi animals moved away to safety early on.[43][55]
Kidōmaru did his best to take down Neji, this was especially apparent in the original manga, where his first arrow ripped a massive hole through Neji's shoulder. The anime greatly reduced the size of the hole. While this may serve as a content edit, it also made it more feasible for Neji to live through such an attack.[56][57]
Kimimaro's encasement within Gaara's sand and his subsequent crushing are accompanied by a significant amount of more blood in the manga.[51][58]
When Sasuke pierces through Naruto's shoulder with Chidori, we see his arm and hand with no obstruction. In the anime, they lessened the violent nature of the strike by whiting out the arm and hand with Chidori's electrical light.[59][60]
Part II
When Team Kakashi decided to rest at a Hot Springs, the women bathing had towels and other objects added to block their nudity.[61][62]
When Sai switches allegiances, he had subdued Kabuto in an alternate fashion in the anime. This was probably changed because Kabuto's hands were left free in the manga, making escape seem possible.[63][64]
In the manga, Konohamaru Sarutobi has a sexy technique that depicts Sasuke and Sai in a sexual position.[65] In the English version of the manga only a silhouette of the two is visible, and in the anime this is taken out entirely.[66]
In the manga, Shikamaru is briefly seen smoking after Asuma's death.[67] However, in the English adaptation of the manga and in the anime, he doesn't smoke; he only carries Asuma's lighter around with him; although at a certain moment, after he's done visiting Asuma's grave, he leaves a lit cigarette.
In the manga when Guren is making his escape from the northern hideout, he brutally kills a number of guards and there is a significant amount of blood.[68] In the anime the blood is removed completely.[69]
In the manga, when Nagato gets exhausted from overusing the Chibaku Tensei he coughed up a lot of blood.[70] In the anime, however, this was changed to a trickle of saliva.[71]
In the manga, when "Kisame" was decapitated, the head landed in front of Sabu.[72] In the anime, this was omitted.[73]
In the manga, after Danzō had badmouthed Itachi in the clutches of Sasuke's Susanoo, the latter crushed him.[74] The amount of blood was heavily reduced in the anime, and the blood spattering on Sasuke's face was removed.[75]
Interestingly, when Furui was impaled by the Eight-Tails, it was more censored than when it occurred in the anime as he was seen as a silhouette in the manga.[76][77]
When Kisame slaughtered the Cypher Division in the anime, the action is censored.[78]
When Armadiko's gender is revealed due to the Island Turtle being flipped upside down, its genitals are clearly shown in the manga.[79] In the anime, the genitals are removed entirely.[80]
In the manga, when Kankurō uses his Black Secret Technique — Machine Triple Shot, blood is seen draining from the Kuroari with Karasu in it.[81] In the anime episode, the blood is omitted.[82]
In the manga, when Gari blows up Tajiki, his blood spatters on his comrade.[83] In the anime, the blood is removed.[84]
Shippūden episode 272 was censored somewhat:
The gash Mifune sustained to his head was not shown despite him bleeding. In the manga, the gash was clearly visible.[85]
When Mifune used Iai Beheading to cut open Ibuse's head, indications of the head being cleaved open are visible.[86] In the anime, however, smoke covered this entirely.
In Shippūden episode 278 when Sakura Haruno pulverised the transformed White Zetsu Army clone, no blood was seen coming from its mouth, whereas in the manga, there was blood.[87]
In the manga, when the Second Mizukage's clone attacks the shinobi of the Fourth Division, he critically slashes one with his axe-like weapon.[88] In the anime, he simply uses taijutsu.[89]
In the manga omake tie-in, prior to Lee crashing in the girls public bath side, they were getting dressed.[90] In the adapted anime episode, this was removed.
In the manga, when Madara reveals the status of the Kage, A had a large puddle of blood coming from his mouth.[91] In the anime, this was removed, as well as a reduction of blood from the other Kage.[92]
In the manga, when Obito states his dislike for Tobi the Zetsu clone, the latter "flips the bird" at him.[93] In the anime, Tobi, nicknamed Guruguru by Obito, gives Obito a thumbs down.[94]
Despite Obito's graphic massacre and massive amount of blood in the manga,[95][96] there was very little censoring of it in the anime. However, in the following episode, the blood covering Obito is coloured black until he returns to Mountains' Graveyard.[97]
In the manga, when the Ten-Tails took on its second form, a shinobi was seen coughing up blood after being injured by the impact of the transformation.[98] This was only heard in the anime. In the same episode, Neji being impaled by the Ten-Tails wood branches in front of Naruto and Hinata was not shown in a close-up view.[99]
In the manga, within his subconscious, Obito was being torn apart from the Ten-Tails' influence.[100] The moment where his head was tearing apart was censored in the anime, only a glimpse of it is shown.[101]