The character names "Father Michael Spamloaf" and "Jerry Steinman" are listed in the film's credits but neither name is used in the film. In fact, actor Angst Argyle plays the interviewed priest and actor Robert Bullock plays Justine's whiny ex-boyfriend.
Several performers are listed in the film's credits as having multiple characters. In two cases, one of the characters is only in the sequel to this film (DMJ Part 4) that shares the entire credit list. Thus, actor Robbie Dee only plays the "black man" (at the bar) and actor Jim Taylor "voyeur man #3" in DMJ Part 3.
Actor Peter North plays both "Willy" and "slutman #4" in the film. The film uses the useless "man #1" as part of the character ID.