Continuity mistake: When Lynch climbs out of the ski chair the second time, there is a shot looking up, and the chair where Parker should be is empty.
Other mistake: After Dan is killed by wolves you can see his corpse is covered by snow, only his hand is showing. When daylight arrives, you see that all the tracks on the slopes are still visible, and big patches of brown can be seen even though it's supposed to have been snowing at least 30 cms, enough to cover a human body.
Factual error: Wolves don't bark. Especially adult wolves.