The "QG" bar that the characters visit isn't a movie set; the scenes were filmed at the Queen's Gambit Restaurant in Woodbridge, VA.
A great deal of ultra-violence and gore was removed from the for-cable edition, which received an R rating when it aired on Showtime.
Originally, in the scene in which Zack tries to cut in line for the bathroom, he is stopped and asked, "Who the f** do you think you are... Tony Danza?" When the movie was released in France, the name "Tony Danza" in that line was changed to "John Travolta" for the French dubbed soundtrack.