Screenplay was originally written as a comedy. After a couple months on the back burner, Jeremy Helal re-wrote it as a drama.
Originally, the "heavy drinker" character played by Eric Catmull, was walking around with a large hammer over his shoulder. Although awkward and hilarious, this was changed so people wouldn't get the idea it was a costume party.
Michael Brown, "the cowboy" actually broke his rear view mirror while shooting the car tantrum scene.