Filmed at Portsmouth Kingston prison, that was recently closed and used as a tourist attraction.
In the scene where Jimmy and Katie are talking after being attacked by a vampire, Jimmy asks if the monsters are 'Einsteins' before correcting himself to say 'Frankensteins'. This was an actual mistake made by Daniel O'Reilly. It was so funny that the outtake was kept in the final film.
Daniel O'Reilly's girlfriend was pregnant during filming. She went into labor two days before the film was supposed to wrap, which meant that all of O'Reilly's remaining scenes had to be filmed without him first, before re-shooting all of his remaining parts on the final day.
Stephen Marcus played "Nick the Greek" in Lock Stock and 2 Smoking Barrels.