Disheartened by the films low box office opening, Paul Walker returned home from dinner, only to discover that Quentin Tarantino had left a message on his machine, praising the film and Walker's performance. Walker was relieved, and happy, that someone like Tarantino had enjoyed the film.
Wayne Kramer was shocked to find out that the movie got the R rating on the first submission. He states in the DVD commentary that he thought that he would get NC-17, but he luckily didn't.
Most of the bloody gunshot wounds were done with squibs, with a handful of CGI ones also added. In the commentary, Wayne Kramer mentions that Bruce Altman was terrified of the squibs because he's never been strapped to them before.
Paul Walker's brother also appears in the film. In an early scene the path of a bullet is re-traced going from one house to another - the Paul Walker character appears in each house. The Paul Walker character sitting at the dinner table in one house is actually Paul Walker's brother.
Thomas Jane declined the role of Joey Gazelle due to scheduling conflicts. Paul Walker was a second choice.