The producers had found a company for sex toys to so sponsor the production. Various of these toys can be seen in the movie. After the last day of shooting almost all the toys mysteriously disappeared amongst the crew members. Funnily enough most female crew members "complained" afterwards that they didn't get any.
The film was shot on 16mm and later edited on an analog system (Steenbeck). When the director and the editor worked on the fight scene where a Brad Pitt lookalike was used as a reference to his character Tyler Durden from Fight Club, they came up with the idea to cut in one frame of a penis. Just as Tyler Durden did when he worked as a film projectionist.