"Katie Featherston" is played by Katie Featherston
"Micah Sloat" is played by Micah Sloat
"Amber" is played by Amber Armstrong
"Dr. Fredrichs" is played by Mark Fredrichs
Enforced Method Acting: Much of the dialogue for the first film was unscripted, with Katie Featherston and Micah Sloat improvising most of it. Also, in some scenes, they weren't told when anything scary was about to happen in order to get a genuine reaction out of them.
Executive Meddling: Averted. When the rights to the film were initially purchased, the studio put the film on the shelf and intended to remake it with a larger budget and more famous actors in the roles; when audiences walked out of test screenings for the film because they were scared, the studio quickly reversed their stance.
Fan Nickname: Fans now call the demon Toby thanks to Kristi calling him as such in PA3.
Paranormal Activity: The Marked Ones has been called Paranormal Activity: The Marked Juans.