When building snowmen and posing for a picture the front of snowmen are behind them therefore the picture being taken would be the backs of them.
When Emory first arrives at the cabin, smoke is clearly coming out of the chimney. Yet, when the camera pans around the living room, after she enters the cabin a minute later, the fireplace is just as clearly unlit.
When they are decorating the tree, the time on the wall clock reads 11:51, which would initially make one jump to the conclusion that the local version of "The Nutcracker" was being performed at midnight. But , as the pendulum is not moving, the clock more likely stopped at nine minutes before noon.
When Emory encounters Scott for the first time she says she knows krav maga. Yet she defends herself with closed fists, even though one of the first things you learn in krav maga is to use open hands, and the palm of your hands in defense.