Continuity mistake: At the end of the movie, Kevin wants to meet "the L girl" at their stop at 7pm. While Kevin is waiting, the camera goes to the clock. First it says 7pm. After waiting a few minutes, it says 7:10pm. Then when Kevin finally gets to Abby, the clock in the background only says 6:55pm.
Continuity mistake: When Kevin and his roommates are playing baseball and having a barbecue on the field, Lance's hair is brown with blond streaks. In the next scene his hair is black again.
Continuity mistake: In the last scene with Kevin and Abby she is wearing a denim jacket. When you see the newspaper picture for the scene she is wearing a leather jacket.