Made back its entire production budget on its opening day at the box office, despite being released in the same weekend as Star Trek Beyond (2016) and Ice Age: Collision Course (2016).
Director David F. Sandberg aimed to use as much authentic lighting for the film as possible. Some scenes were only lit by candle lights or fluorescent tubes.
The mannequins in the basement were not brought in for the movie. They were already placed there by the owner of the house.
Teresa Palmer hadn't seen the design of Diana before filming, until she filmed her first scene with her on a completely dark set. This was an intentional directorial choice so as to provoke a genuine reaction of fear when first seeing the design. Alicia Vela-Bailey, the woman in the costume, was previously Palmer's stunt double on I Am Number Four (2011), it would have ruined the effect had she seen her prior as she would have recognized her therefore losing the authentic expression of fear.