The film that the hero and heroine go to see on their date is The Big Feast (1973), which deals with characters who set out to eat themselves to death - a touch of ironic humor in view of the plot of "Frightmare." However, the dialogue we hear is not from The Big Feast (aka: "La Grande Bouffe") but from Pete Walker's previous film, House of Whipcord (1974).
Pete Walker said despite the film's grim and dark mood, the cast and crew were actually quite jovial throughout the filming and enjoyed themselves immensely.
Critics bashed Frightmare in early reviews, particularly citing not only the violent content, but also seeing the film as a harsh statement against the justice system's failures. Pete Walker stated that he felt the controversy only helped the film to become a bigger success.
Star Paul Greenwood, who plays Graham, landed a role in the film because he and director Pete Walker were old friends who often played football together.