Well actually like everyone stated, Sakura in this episode is from the alternate Moon Eye Plan Universe (don't know how that works since I thought it was a genjutsu) and she bumped her head entering "our" Naruto universe. She couldn't remember anyone, but when she did start to, she remembered them in the way they were in her universe. I.e., Sasuke as a playboy, Neji and Lee ( I guess Lee?) as perverts, that is why Neji eyes were covered.
Hinata dressing provacative and Shikamaru being dopey. I guess SPOILERS......
....Naruto is evil in her universe so maybe that is why she couldnt quite remeber him... not sure. And this also explains where "our" Sakura went as well as why Naruto wasn't around, they were sucked in the "Tsuki No Me" test genjutsu that Tobi has made.
Hope that explains all!!!