Mila Kunis is ashamed of this film.

Originally, the film wasn't going to be a sequel to American Psycho (2000).

The entire film was shot in twenty days.

The filming title was "The Girl Who Wouldn't Die".

In an outtake between William Shatner and Kim Poirier, William bursts out in a coughing fit in which Kim reacts to in character. After she walks off, William says "Wow, that girl really gets to ya!".

Starkman references Ed Gein as well as The Texas Chain Saw Massacre (1974), both are referred to in the first American Psycho (2000).

Kim Poirier, Lindy Booth and Boyd Banks all appeared in Dawn of the Dead (2004).