the entire k-on anime is non-canon to me
order of canonocity to k-on
manga = canon
anime = non-canon
movie = non-canon
ura-on = alternate universe canon
edit: for me, when it comes to manga and anime, whatever is published first is the true canon. exceptions are for stuff like evangelion, where the anime was conceived first, but the manga came out as promotion for the tv series.
What is canon? A miserable pile of secrets.