- The film was originally named after the protagonist Cotton, and then changed from "Cotton" to "The Exorcism of Ivan Forest", and was finally confirmed as "The Last Exorcism" when it was released.
- The film was created after being inspired by the movie "Blair the Witch".
- The film was shot with only one camera.
- The film’s screenwriters Heck Potter and Andrew Grande were originally candidates for the film’s director, but later the film’s guide fell into the hands of Danielstan.
- In order to promote the film, during the Los Angeles Film Festival, the producer specially created a website under the name of Father Cotton Marcus, the protagonist of the film.
- Before she auditioned for the film, Ashley Bell started to read books about exorcism and religion, learned some culture and legends in this area, and bought a lot of tapes about demonic culture and exorcism lectures and came back to study .
The Last Exorcism behind the scenes gags
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Cotton Marcus: Did Caleb act any different after your mom passed?
Nell Sweetzer: I think Caleb got frustrated. He got kind of scary. He started hating God a lot.
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Louis Sweetzer: [about Nell] I've tried keeping her as close as I possibly could, maybe even a little too protective. I'll admit to that. But somehow, still, the devil got in her. Her mother gave her a small crucifix, and it burns her. The symbol of our Lord, and she can't wear it.