The father of the victim whose life was nearly claimed by two girls that worshipped the Slender Man has spoken out against the film, citing how they feel disgraced by Hollywood making a film about events that led to tragedy.

Joey King and Javier Botet have both played characters in the Conjuring Universe. King played as Christine in The Conjuring and Botet played as The Crooked Man in The Conjuring 2.

It was rumored that Krampus (2015) is a prequel to this film, though that rumor was later debunked.