Filmed in a working factory at nighttime and on weekends over the course of seven months.
The opening credits shot was filmed in one take, with no hidden cuts.
The movie was filmed in Morristown, Tennessee, where The Evil Dead (1981) was also filmed. The brick used by Karen as a doorstop when she throws out the garbage is from the original The Evil Dead (1981) cabin, which burned down in the early 1980s.
The movie's script was written with the exact factory where it was filmed in mind.