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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: I understand where you're coming from- just remember too, that you didn't exactly warn me about this kind of stuff before we moved in together, so I think I have a little bit of say in what we do.
Katie: I get that, but honestly what was I supposed to say? On our first date, 'Hey, I think there's a demon that I think has been following me.'
Micah: No, but maybe on our fifteenth date, or our thirtieth date, or when we decided to live together... that might've been a good thing to bring up.
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Micah: Hey, hey hey hey hey! Let's talk about this first. It's just, I'm in control, I'm making progress.
Katie: No, you haven't been having any progress, and you're *not* in control. *It* is in control, and if you think you're in control, then you're being an idiot! Not a single thing you've done has helped, and I'm sorry, I don't mean to burst your bubble, but the camera hasn't helped and the stupid footprints haven't helped; do you think that thing would have left footprints if it didn't want to? No! It did it because it wanted to! It wanted you to find my photo, it can be anywhere, it hears what we're saying right now.
Micah: Hey! How the fuck do you know?
Katie: You are absolutely powerless!
Micah: That's, that's not at all true, and you know it.
Katie: Well, get over it.