Revealing mistake: When a huge avalanche falls on the red skier, the scenes of the snow falling are scratched and full of dirt, revealing it's stock footage.
Revealing mistake: When Caroline (Mia Farrow) is hanging off the broken bridge railing, in the wide angles she is replaced by an obvious stunt. Furthermore, when David rescues her, the stunt woman is always acting calmed and natural, even helping David, as opposed to the close-ups of Farrow, nervous and trembling.
Revealing mistake: After the birthday dinner and dance, the exterior shots of snow falling show the snow being sprayed from a lower point on the right side of the screen. Shot changes and now it's being sprayed from somewhere behind the bleachers.
Revealing mistake: When the father and son climb out of the chairlift and hold on for their lives, the kid is very obviously replaced with a grown-up stunt.