The tap code for gay sex, seems to have been inspired by the escapades of the Republican US Senator from Idaho Larry Craig. The incident occurred in June 11, 2007, in one of the bathroom stalls of the Minneapolis-St. Paul International Airport. The senator help veto many bills that would have furthered advanced gay rights.
The Corridor or hallway fight scene resembles 2003's "Oldboy" film.
The pep talk the Archangel gives Cassidy is Gene Hackman from The Replacements.