Continuity mistake: During the whole movie during the night (maybe days too), the objects around the house change, move, appear and disappear/vanish, and the lights turn on/off radically without being touched. (00:00:30 - 01:31:06)
Continuity mistake: When Martine hears noises in the house, she goes upstairs to get Hunter and then starts cleansing the house with incense. Before she goes upstairs, notice how the pots and pans hanging in the kitchen are different makes/colours when she come back downstairs with Hunter. They change again when Daniel and Kristi return home. (00:24:10 - 00:25:00)
Continuity mistake: The last two pictures on the left on the wall going up the stairs change continually throughout the movie, at least 10 times. (00:24:35 - 00:26:35)
Continuity mistake: When Kristi sits down to have her coffee and read her magazine, the coffee cup is perfectly in place before the cabinet doors burst open and she runs away. When she comes back and closes everything, her yellow coffee mug is gone.
Continuity mistake: During the last night Martine is working for the Rey family, she is shown saying prayers in the kitchen and TV rooms. During that time, the kitchen camera shot has knives, spices and a chopping board on the counter, but in the next kitchen shot, everything is replaced by a fruit bowl. You'll also notice that the hanging pots and pans change in number, order and colour and the flowers located on the table change variety and also too the bowl/vase.
Continuity mistake: Ali discovers markings on the inside of the basement door. When Daniel goes down to the basement when the power goes out, the markings are no longer there.
Continuity mistake: In the scenes where the baby is shown moving about the house opening doors, the nursery room door had been left open yet he is shown opening it. The basement door is shown as being opened and the next shot shown as closed. The timecode doesn't allow time for the ghost to have done anything, and without sound in the film.
Chosen answer: It's the demon.
Manky