Factual error: Josh Hartnett's roommate is reading the paper, which shows results from a big football game. But this movie is set during Lent, months away from football season. (The filmmakers admit this error during the DVD commentary.).
After Matt finds out that Nicole is engaged, he goes running through the streets. When he goes running past a glassed store display, you can see the reflection of a white van with the sliding passenger door open and a cameraman.