This movie was shot in extremely cold weather in the months of November and December.
Eric Colvin accidentally hit Nadja Brand in the mouth with the butt of the rifle, thus causing Brand's lower lip to swell. Production on the film had to be shut down for several days as a direct result of this.
The tip of the knife broke during the shooting of the scene in which the man cuts Holly's tongue out.
The man was originally conceived as an American.