Continuity mistake: When Ashley is putting the lingerie into Rob's pants, and after he leans on her, it goes to a shot showing their waists, and her with her hand down his pants. In this shot, it shows that Ashley has her corset on again, but in the next shot, it's off. (00:25:10)
Continuity mistake: When Marshall is colouring in his drawing of the Cheerleader the part of the skirt on his right is coloured in but when we look at it again he is just about to colour it in.
Revealing mistake: In the scene where Marshall "Lube" Lubetsky has just fallen out of the cable car on the mountain and Ashley climbs down to get to him we see foot prints in the snow coming from the trees on the side to where Marshall is lying, giving away that the actor walked to that position, when the character is meant to have fallen there.
