Eric Spudic says that his script "Killers By Day, Killers By Night" (which became "Killers By Nature") was written one year before the 20 April 1999 Columbine tragedy.
The crowbar was purchased at WalMart for ten dollars.
This film was shot without permits and production insurance.
Eric Spudic considered hiring Linnea Quigley as a voice on an answering machine and Robert Z'Dar as Cory's father, but neither one came to pass.