It's not canon what's currently taking place with the manga, shippuden 311 is the one-shot prologue that Kishi wrote for Road to Ninja, it's an alternate reality.
I don't care if it was filler or not, I loved this episode. It was one of those ones where it's just light hearted humour, which is honestly one of the things I love about Naruto. Come on, who can't like it when Guy and Lee have one of their moments? XD