Other mistake: When Amy runs out of the basement wearing Robert's pants, the pants are at full length, with the belt under her arms and the bottom of the pant legs at her ankles. When she is standing next to Robert, though, it is clear that he would have to pull the pants all the way up to his ribs for the legs to be the right length on him. Also, the pants are unzipped and the zipper pull is hanging just below Amy's breasts. Since a pants zipper is usually just an inch or so above the crotch, Amy would not be able to pull the pants that high unless there was a 12" drop between the zipper and the crotch of the pants.
Other mistake: At the end in the kitchen there are a few camera angles that features a black object hanging into shot. This item moves perfectly with the camera and so is not part of the set or a boom mic. Perhaps something was dangling in front of the lens during filming. (00:20:45)Ssiscool