Continuity mistake: In the scene where Kevin and Wendy are talking outside of the school, Kevin's hair change positions depending on the shot. At the same time, each time the shot goes back to Kevin, not only does his hair change, but the people behind him. It switches from Julie and Perry to random people, then back again.
Continuity mistake: At the end of the scene where Ashley and Ashlyn are burning in the tan beds, one of them looks out of the side of their tan bed. This is supposed to be Ashlyn, but she's facing the wrong way, which means she would have to be in the tanning bed she didn't get into to make this shot right.