I'll say one thing about this current filler arc despite the fact that I do enjoy Kakashi's flashback on his ANBU days and seeing Minato's accession to the Hokage. My feeling is that I think this filler arc is probably the worst (bar none) arc, which is because of the fact that it is riddled with bouts of inconsistencies and lack of continuities with previous episodes and manga.
The best example is this particular episode of young Shinobis (Asuma, Kurenai, Guy, Raidō and Genma) slatuing the return of third Hokage. According to Shikarmu, Minato had the Hokage Guard Platoon who are well-versed with the FTG jutsu (Raidō Namiashi, Genma Shiranui, and Iwashi Tatami). So, how can Genma and Raidō looked so young (probably in teen years) yet they are not assigned as Minato's Hokage Guard Platoon?