Revealing mistake: Throughout the movie, there are mixtures of real snowfall and artificial flakes. When John is at Paul Carnury's house, in particular, the "fake" snow is quite apparent. John could be standing outside in the snowstorm yet little or no snow hit his jacket. (At one point, a few flakes land on top of his head.) When John breaks through the front door, a gush of "flakes" come inside and the ones on the back of his jacket fly and/or roll over his body. "Snow" even bounces upwards off his jacket. (01:13:34)
The Wolf of Snow Hollow (2020)
1 revealing mistake - chronological order
Directed by: Jim Cummings
Starring: Jim Cummings, Robert Forster, Riki Lindhome, Chloe East
Other mistake: When PJ opens the door for the officers, the painting on the wall behind him is not straight as would be expected - it is how it would appear if looking down a hallway (the top and bottom of the frame are not parallel). (00:33:56)
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Suggested correction: There's absolutely nothing wrong with the painting. It isn't parallel because the wall behind him is at an angle from the position of the camera. If the wall was parallel with the camera, then this "mistake" might be right... but it isn't. The wall is at about a 45 degree angle facing away from the position of the camera. (Although to be fair, even if the painting was crooked, I don't see how that would be a "mistake.").
Sheriff Hadley: You're gonna have a hard time getting my generation off the stage. Willie Nelson's still doing concerts.
John Marshall: Yeah, I mean, to be fair, Dad, Willie Nelson is a guitar player and he's not doing a lot of heavy police work.
Trivia: Robert Forster's last acting role.