When the teacher is reading Jamie's story from the paper, she
reads the line about Myrna being "zapped" along with her friends. Then she goes on to read about the Prince. When Janie looks back, the teacher is reading the line about "zapping" Myrna again.
When Jamie is talking to Marco at the dance, she is wearing long, dangling earrings, and the right one keeps switching from being caught up in her upswept hair to being loose.
During the final song, the whale is hanging back up on ceiling in perfect condition, after it had been 'dropped' as part of save the whales protest.
When Jamie catches up with Connor in the parking lot at the dance, he is standing by the open front passenger door of the four door pickup truck his brother is driving. After Connor and Jamie kiss and they are walking back in to the building, Connor's brother is watching them through the open back passenger door which no one had opened.
When Jamie walks down the passageway to leave to go on tour, she is wheeling her luggage. In the next shot the luggage is gone.
At the dance, when Lenny was singing his song that he has supposedly never let anyone hear before, you can clearly see Jennifer #1 singing along with it.