- Creator Backlash: David F. Sandberg has nothing nice to say about the short film contest hosted by the film, though continues to stand by the product itself. He also didn't care for the stinger tacked on after the credits, which is a short teaser for The Nun.
- Fake American: Australians Anthony LaPaglia, Miranda Otto, and Philippa Coulthard played Samuel, Esther and Nancy, respectively.
- Hey, It's That Place!: Westworld fans might recognise the farm house as being Dolores's house too.
- Real-Life Relative: David F. Sandberg's wife, Lotta Losten, portrayed the Adoption Agent, which is a given considering Lotta appears in all of Sandberg's films and shorts.
- Release Date Change: Originally slated for release on May 19, 2017, it was pushed back to August 11 to avoid competition with Alien: Covenant.
- What Could Have Been: David F. Sandberg initially wasn't keen on directing - as he dislikes horror sequels. He signed on once he was told the film would be a standalone prequel.
Trivia / Annabelle: Creation