The ending of Episode 26 (the final episode) was predictable.
Episode 25 was the best. It was fast paced and full of funn. The beginning scene was unexpected and the timing of the comedy for this episode was just excellent in general.
I enjoyed the goodbye song to Azusa in Episode 24. It's not much of a spoiler. We know she's one class behind.
Azusa's angst over being separated with the other girls was actually a pretty good storyline now that I think about it, although the story went to the only place it could have gone. The one thing I am glad that never happened though...none of them ever got any boyfriends. No, it's not because I'm in love with any of the characters, but isn't that what every show out there does? It's refreshing for me to watch any show that doesn't involve romantic relationships. Although I still think there is sexual innuendo between Yui and Azusa (lol).
Looking forward to the movie. I wouldn't mind watching them have tea and cake for 2 hours. It's hard for me to like most anime because I'm not really into violence. So K-On! fit what I was looking for.