The parents in the film, played by Stephen Dunham and Alexondra Lee were a real life married couple. Sadly, Stephen Dunham died on September 14, 2012 of a heart attack, shortly before the film was theatrically released.
Brady Allen's character, Robbie, was named after Robbie Mannheim, a child that in 1959 was an alleged victim of an evil possession and he had an exorcism to save his life.
The chronological order of the films is: Activité paranormale 3 (2011), Activité paranormale 2 (2010),Activité paranormale (2007), Activité paranormale 4 (2012), Activité paranormale: L'empreinte du démon (2014) and Activité paranormale: La dimension fantôme (2015).
The first actual sequel in the series. The prior two sequels were prequels.
Though it may seem like a novel concept, incorporating a laptop camera into "Paranormal Activity 4" played an important practical role in the filmmaking. "Anything can go on behind, and she wouldn't necessarily know unless the person on the other end of the video chat told her that it was behind her," Schulman said. "It just seemed like a really fun way to carry a camera and film yourself because otherwise there's no other way to shoot close-ups in a 'Paranormal' movie. Usually you're filming forward, so this way you can actually get a reaction shot."