Dom Wynter actually has an afro hairstyle, but had to wear an afro-wig so it would match the hair on the severed head later in the film. This technique was used in Stuart Gordon's Re-Animator and Brian Yuzna's Bride of Re-Animator, where actor David Gale had to wear a somewhat more obvious hair piece for the exact same reason.
The opening shot of exploding guts hitting and sliding down the cellar wall was actually shot nearly a year before principal photography, during the production of a teaser trailer to raise interest and test out lighting effects. It is the only shot from the trailer that remains in the finished film.
One day of shooting was accidentally shot in the wrong aspect ratio, and had to be cropped from 1.33:1 to 1.78:1 in post-production.
Moggz, the director's girlfriend, spent six months collecting jars from pasta sauces for use as props in the cellar to contain various multi-colored liquids.
The children in the opening and closing logos for Untamed Aggression Productions are the director's sisters Isabelle and Olivia.