Other mistake: In the main titles, for casting, the name "Brennan Dufrense", is listed. It should read 'Brennan Dufresne'.
A Guy Thing (2003)
1 other mistake - chronological order
Directed by: Chris Koch
Starring: Jason Lee, Julia Stiles, James Brolin, Selma Blair
Audio problem: During the wedding part at the end the movie, when Paul announces he doesn't want to marry Kerry, Kerry looks at him and says, "Paul?" but you can see she is really saying, "What?" The voiceover comes in late as well. This is on the video version.
Aunt Budge: I would kill for some diarrhea! I haven't had a bowel movement in 17 days.
Trivia: The guy who plays 'Mister minister' also played Julia Stiles' dad in 10 Things I Hate About You, which also took place around Seattle. They give each other funny confused looks when she is leaving Jason Lee's apartment in the beginning of the movie.