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The film is the directorial debut of Oren Paley.
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On how to capture some noise and movement outside the bedroom, the actor Michael Slott provided a lot of professional advice, because when he was in college, he was a cameraman on the school TV station, and sometimes Oren Perry even I had to ask him about the use of the camera, such as whether the mirror should be turned off.
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The original plan was to enter the DVD market in early 2008, but because the producer and the distributor did not agree on the distribution, the distribution was delayed repeatedly. Oren Paley got angry and started his own distribution business. He successfully sold the copyright of the film to 52 countries in the world.
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The film did not enter the theater screen at the beginning, but was directly made into DVD. After getting good profits in the DVD market, and with the help of director Steven Spielberg, the film was able to be shown in theaters.
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At the suggestion of Steven Spielberg, director Oren Paley revised the ending of the original version.
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The film was shot entirely using a portable home DV.
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The production cost of the film is only 11,000 US dollars.
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There is no script for the film, and all the lines are created on-site.
Paranormal Activity behind the scenes gags
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Micah: [discussing demons] Basically, they're these malevolent evil spirits that only exist to cause pain and commit evil for their own amusement. It's pretty creepy- I mean, they stalk people for years, like decades, and sometimes they're really intelligent in the way they do things to freak you out.
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The Psychic: You cannot run from this- it will follow you. It may lay dormant for years. Something may trigger it to become more active and it may over time reach out to communicate with you.