During the dog attack, the arm the dog is biting changes from right to left multiple times between shots.
After the truck flips over, but just before the passenger door opens there are obvious boot prints in the moisture on the door.
When the sheriff arrives at the building with Julia in the back seat, she manages to escape from the car by easily opening it from the inside. Today's police cars are designed so that the suspect cannot escape regardless of whether or not the door is locked or unlocked; in such a way her the door can only be opened from the outside.
When Julia is attacked by the dog when she opens the door of the Tall Man's truck, you can clearly see the heavy protective padding on her arm.
The film is supposed to be set in Washington State. However, in the beginning a train is shown crossing in front of the town and the crossing reads "RAILWAY CROSSING." In the United States, all rail crossings are labeled "RAILROAD CROSSING." The film was obviously made in Canada. Also, the train is a Canadian Pacific locomotive.
Tracey makes a comment that she has to be in Kaslo for a job interview in 45 minutes. Kaslo is in British Columbia near where the movie was made, not in Washington. Even if she lived right on the border, Kaslo is almost two hours away.