Various Further spirits within the Five Keys penitentiary complex, that prominently feature in the film's various trailers ended up omitted from the finalised film.
(at around 4 mins) Early in the movie, when the kids are going to bed, you can see a doll on the top of a bookshelf. The doll looks just like Sinister (2012).
Although this was filmed in California, the movie takes place in New Mexico. Vehicles in NM only use license plates on the rear of the car, never on the front.
(at around 1h 5 mins) When Leigh Whannell's character finds the vintage magazine, the back cover shows an ad for some novelty glasses called Hypno-Specs. 'Specs' is the character's moniker.