Audio problem: In the scene at the party when Tai sits up after Elton placed her on the table she hits her head on a light hanging overhead. The sound the bump makes is not consistent with someone hitting the light with their head in such a manner. It appears that it's just a sound effect added in. (00:37:30)
Continuity mistake: Amber's hair length changes throughout the movie. For example, when they are in gym class her hair is long but in the scene where Cher and Christian first meet her hair is short. This happens throughout the whole movie.
Answer: It's Counting Crows' cover of "The Ghost In You".
Bishop73