The scary, ugly face seen on the movie posters for this film was originally part of the poster art for the US/British monster film, It! (1967), starring Roddy McDowall.
This was the first film ever to be rated X by the MPAA based on violence alone.
Before the passing of the Video Recordings Act, a cut version was briefly released by Media Video in the UK in the early 1980s. Although it was never listed as an official "nasty video", it was one of the films featured on a tape compiled by outspoken critic of sex and violence Mary Whitehouse and shown at the Conservative Party conference in 1984. This film has yet to receive a UK certificate.