The scene where Sean beats the dealer to death was cut by seven seconds. The original scene featured the dealer spitting out teeth and bloody pieces from his cheek. The scene was cut in order to get the R rating and not NC-17.
After poor test screenings, New Line had 15 Minutes (2001) director John Herzfeld come in and shoot some additional scenes - notably the ending and cemetery finale - to wrap things up. Also, dialog scenes were cut and some scenes also shortened to speed up the pace. This caused the film to miss several release dates. Regular Herzfeld composer J. Peter Robinson also worked on some new score to jazz things up. New Line also had to change the name from El Diablo due to a law suit from the game developer Blizzard. Potential titles included Push The Limits, Diablo (no El in front), Sean Vetter, Vetter and This Man's Dominion. A Man Apart was finally chosen as the studio felt it suited the theme of the film.
When Sean and his group get in the silver car to leave the plane hanger, the car has a temporary license sticker in its rear window. When the car pulls out of the hanger, the temporary sticker is gone and there is a proper license plate where one should be.
When Vetter goes into Lucero's cell and lights his cigarette, we hear the clink of a zippo-style lighter, but see a flame that is obviously that of a disposable lighter.