When the group is en route to the Ski Lodge, all of the dialogue in the car is obviously dubbed. Most notably, none of Skyler's dialogue matches his lips in the car. Some of the other characters dialogue also does not match their lip movements, either.
When Kimberley is hiding in the closet, from the Evil Skier, there is a hole in the door. In one shot there is blood all around the hole, but when the Evil Skier puts her hand through to open the door, the blood is gone.
When Skyler gets the poker driven through his camera and into his skull through his eye socket, there is a ridiculous amount of blood that comes pouring out through the camera. In reality there is very little blood flowing through this part of the body/head.
The goof items below may give away important plot points.
After finding their friends laid out in the snow and dead, the remaining four return to the lodge, upon which Kimberly immediately strips and jumps into the sleeping bag on the sofa. As the other three decide to go upstairs to stitch up Skyler, we can see Kimberly wearing a long sleeve BLACK shirt. After the first aid scene upstairs, we return to Kimberly moving around downstairs and she is now wearing a long sleeved WHITE shirt.