In the prologue, when the camera gets in the house, we can see a keys on the couch, and then, the keys are no more there.
The cellphone from the main character, changes several times during the movie. Also, the few times when she is talking with someone in the cellphone, the screen of the same never turns on.
When she go upstairs, at the very end of the movie, the baby shouldn't be in the bed (presumed to be kidnapped by The Man), but is clearly seen in there.
The reflection of the photographer can be seen a few seconds on the TV every time the camera passes in front of the screen.
The TV show news that Alice is watching, says that the mental institution where The Man escape, is located on San José, California. At the very start of the film, the titles says that the movie takes place in Delaware.