Other mistake: In the scene where the mirror cuts his hand, Ben touches the mirror with his left hand. In the very next shot he is holding the flashlight with his left, pointing on his wounded right hand. Right after that he switches hands again. (00:23:35)
Other mistake: In the scene where the son is woken up by the "screaming woman", when the mother rushes out of her room you can see the sun in the window behind her, despite the the fact the scene takes place at night.