A Baxter is the character in every romantic comedy who is the "sensible" choice. He/she is the current boyfriend/fiance of one of the main characters, who gets left at the altar/airport/wedding rehearsal when the main character realizes she's in love with the predictable passionate romantic interest.
Despite playing a couple in the film, Michelle Williams and Paul Rudd never actually share any scenes together.
The church scene was filmed at Christ Church on Clinton and Kane Streets, Brooklyn
Michael Ian Black and Catherine Lloyd Burns play a couple whose names are Ed and Stella respectively. Ed (2000) and Stella (2005) are the names of two television shows on which Black acted.
Michael Ian Black, Joe Lo Truglio, Ken Marino, Michael Showalter, and David Wain had all previously been regular performers on and writers for the MTV sketch comedy show The State (1993).