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.
Trivia: Part of the movie was shot in Toronto (actually, the guys' apartment is in Toronto, I remember seeing interviews), along with where it takes place, Chicago. If you watch the credits and you watch where the cast is dancing while Al Green's singing, you can see a Tim Horton's Roll Up the Rim billboard in the background. Also, that scene takes place at the Eaton's Centre in Toronto.