Continuity mistake: When Terri's brother is filming Terri and her friend leaving the school, the view from within his video camera says he has been recording for one minute and seventeen seconds, which turns into eighteen. But when we come back to the view from his video camera a few shots later, he is at one minute and sixteen seconds.
Other mistake: When Paul is making the DVD, there's a record of Terri performing a song she wrote(One more mile to Jericho). At the very end, outside the school the kids start play some music together with Terri singing. That's supposed to be some random thing like it was before, but actually they play and sing Terri's own song. How come?
Continuity mistake: When Robin has her mental breakdown about not getting the solo she goes out side and begins banging her head against a vending machine. Then Jay comes to talk to her they walk to the edge of the balcony and her shirt goes from collar bone height to almost showing her breast.
Continuity mistake: At the end of Terri and Jay's song, Terri changes her position (which hand is holding the mic, etc) in between each song. It might be deliberate, but it's a mistake none the less, since this was supposed to be filmed in real time. It looks like a music video, which it is indeed not.