- Casting Gag: In 2013's The Conjuring, Patrick Wilson plays Ed Warren a paranormal investigator who intervenes to save a woman possessed by a demon from killing her own children. In Chapter 2 (made by the same director and released less than three months later), he plays a man possessed by a demon and compelled to kill his own children, before paranormal investigators intervene.
- Fake American: Australians Angus Sampson, Leigh Whannell, and Rose Byrne (as Tucker, Specs, and Renai respectively).
- Production Posse: Producers Oren Peli and Jason Blum worked together in Paranormal Activity, a fellow Blumhouse franchise. Meanwhile, James Wan and Leigh Whannell have been friends since their film school days and most of their projects before The New '10s (Saw, Dead Silence) involved both in some way. Finally, Patrick Wilson has starred in three separate James Wan franchises — this one, the Conjuring series, and the Aquaman films.
- Star-Making Role: For Ty Simpkins and Lin Shaye despite her having been in the acting business since the eighties.
Trivia / Insidious