When Jules punches out Brody at the bar, the kitten runs off screen to the left. In the next shot, the kitten is back where it was, being held by Cyd Charisse.
Early in the movie, Brody's first name is said to be "Max" multiple times. At the end of the film during the hearing, the one time the judge states his name he says "Mike" Brody. In the on-screen credits, the character is only listed with the last name "Brody."
At the beginning of the film the snow capped mountains in the background of the lake are exactly the same as in the end of the film, which is supposed to be months later.
During the last trip through the rapids the canoe passes by the same pair of trees at least three times.
When Vincent is tending to the Father at the cabin, the cabin is dark inside, so he lights a lantern. The next scene shows Pedley coming up to the cabin on his dogsled in broad daylight. But when Pedley enters the cabin it is dark outside.
No human opens a Grizzly trap with his hands. They made a special tool that you used a pair of to compress the springs with.
At a temperature of 31 below 0 exposed skin results in frostbite in 5 to 10 minutes.
The Mountie tunic is that of the pre-1904 North West Mounted Police, but the Stetson hat was not worn officially till after 1904.
Although D Division was issued the broad-brimmed Stetson as a tryout in 1887. It was D Division that was sent to police the North country that year, including the Klondike Gold Rush.
At the 0:39 minute mark the sound of several dogs barking is heard, but none of the sled dogs appear to be barking.