Toward the end of the film, when the heroes are waiting for the helicopter, there is a shot of the building with the main door partially open. Yet, when the helicopter lands, the door is fully closed and the characters struggle to open the door as it is frozen shut.
As the rescue team gather after they are dropped and try to determine which way to go, you can clearly see bushes and shrubbery in the background. They are supposed to be on the north pole, there is no vegetation there.