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.
Franchise Killer: Somewhat, but not a lot of people enjoyed P4 due to being the weaker films (ironic since it has more memorable and likable characters than that of PA1 and PA2), although The Marked Ones seemed to have gotten some good reception.
Now there are recent channels on Facebook, Twitter, and Youtube that follows a man named Jacob Degloshi. The videos appear to be leading to Paranormal Activity 5 while giving more detail on the Featherston sisters' past.