Bret Roberts who plays the Nightstalker was also cast early. Director Chris Fisher met him in 2000 at the Sundance Film Festival. He was passed out on Chris's couch in the middle of the afternoon. Chris didn't know who he was, so he shook him and asked. The two ended up becoming good friends. And Chris cast Bret because of his resemblance to Richard Ramirez, whose story the film is based on.
Most of the locations shot at were either free or donated. Some are even the houses of crew member's who worked on the film.
The movie was shot in 16 days. Three five day weeks. Then one extra day.
Actor Joseph McKelheer, who played the demon, was going so crazy in the car that he cut his head open. The crew thought it was prop blood, and he told them what happened, but he wanted to keep filming.