When Det. Pat Lakewood arrives at the scene of the jackknifed trailer, Russ throws a crow bar at the Detective's windshield and it breaks. In the next shot as Detective Lakewood pulls away, the windshield is no longer broken.
When Crystal is wearing the Xmas outfit and fighting with Dick, her cape goes from her cleavage to over by her arm between cuts.
In Dick's office there was a clip of The $25,000 Pyramid. The movie takes place in December of 1988. CBS cancelled the $25,000 Pyramid in the summer of 1988.
When Russ pulls onto the main road with the tractor-trailer full of snowmobiles, the wheels of the trailer can be seen steered out to cause it to "jack knife". The wheels of a trailer are fixed in place and cannot be turned left or right.
When Russ and Gig are leaving the Denny's, a sign for "Big-K" can be clearly seen in the background. The film is set in 1988, but K-Mart did not adopt the Big-K logo until 1996.
While Russ and Gig are arguing about Dale the Thug outside Denny's, several cars from the 1990s can be seen in the parking lot.
The Denny's restaurant is decorated in the chain's '90s style, with a newer green logo.