When the they first show the Evil Snow-Plough Man, he's chasing kids and they run off to the left side of the road as proven when the kid's sled gets crushed. However, once he's past, they all pop up from a mound of snow on the right side of the road.
Location filming in Calgary's Mount Royal neighbourhood was disrupted when two bank robbers crashed their getaway car into the set. They hit a fake police van and were soon surrounded by over a dozen men and women in uniform. They surrendered only to find out later that they had surrendered to extras. (The real police showed up soon afterwards.)