When Annabel hears the girls playing, she goes into their room to tell them how late it is and to go to sleep - but it's light outside. There are about 3 other times when it's supposedly nighttime and the light is streaming in through the windows.
The film is set in Virginia and while most elements are factual, such as the state seal in the librarian's ID badge, all cars in Virginia have a State Inspection Sticker on the center of the windshield. This is missing on all cars in the film.
When Burnsie first finds the cabin and the girls, as he walks up to the cabin his shadow is visible against the door. The sun can be seen behind him, so any shadows should be cast towards the camera. The reason for the shadow is the board reflector used to provide fill light for the scene, but it can not accounted for by the depicted environment.