On one of the last nights of filming in Edmonton, the temperature was twenty below zero and the entire cast and crew were freezing, so heating bars were brought out and placed around the set. Between scenes, the cast would gather around them to warm up. However, no one noticed that the blue jumpsuits the leads were wearing might not be heat-resistant. It isn't visible in the final film, but at least one pair of blue jumpsuit pants had melted across the front during filming, exposing white lining.
Jonathan Scarfe's name is misspelled in the opening credits as Jonathon Scarfe.