Other than the obvious lack of vapor when the characters breathe...
My only problem with the movie is that when the guy decides to jump down, they don't think about or do anything to shorten his fall. They could have made a makeshift rope using their jackets, the remaining ski pole and maybe the snowboard too. At that height, anything would have helped.
It could still have led to the character getting injured, but at least they would have tried something realistic.