Continuity: When Rachel enters the reception at Shelter Mountain Inn the caretaker asks her to pick a card from a deck. She picks the nine of diamonds, but when she gives it back to the guy you get a blurred glimpse of the card, and it is a four of something. (That she finally agrees that the seven of spades is the right one is probably because she gets tired of the game.)

Continuity: When the woman is watching the film and trying to see the lighttower, she has blood in her nostrill even though she has not yet started to bleed.