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 an R rating and not an 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, dialogue 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.
Knockaround Guys (also from New Line Cinema) and A Man Apart were shelved for a year after the success of Vin Diesels previous movies The Fast and Furious and Triple X. New Line Cinema felt both movies would be more successful financially with a bigger name action star attached.
Larenz Tate and Timothy Olyphant later go on to co-star together in an episode of the television show Justified (2010), only with their roles reversed, as Olyphant plays a U.S. Federal Agent, and Tate on the opposite side of the law.
In the scene where Sean meets Hollywood Jack for the first time in front of the tanning salon Sean pulls up and blocks the Porsche exit from the parking spot. But at the end of the scene you can see that his truck had to have been moved in order for Hollywood Jack to leave.