During production, the pipes in the vacant warehouse cracked, raining down a fountain of excrement on the cast and crew from one of the toilets on the second floor.
The 115-year-old building that the film was shot in has long thought to be haunted. In one of the scenes when actor Danny Salmen (Mike Hancock) is stalking actress Meisha Johnson (Jennifer Wilkins), a light-colored shadow appears through an open door of the room he's in, and then disappears as he leaves the scene. The filmmakers didn't notice this until they got into the editing studio. It, of course, was kept in the final cut of the film.
Because of Minneapolis city fire codes, real fire could not be used in the warehouse. Most of the smoke and all of the flames were added later with computer animation.
The bathroom scene took almost six hours to film. Actor Paul Cram (Craig Teller) had to lay perfectly still on the cold cement ground with his pants down for entire time.
Writer/director Dav Kaufman finished the first draft of the script five days after conceiving the story.