Director Lee Cronin stated in an interview that 6,500 liters (or 1,720 gallons) of fake blood were used for the movie.
The film was originally meant to be released exclusively through HBOMax via direct-to-streaming, but it performed so strongly during test screenings that the studio decided to release it theatrically instead.
The pizza place is called Henrietta's, a reference to Henrietta Knowby, the demon in the basement in Evil Dead 2.
Inside the cabin in the prologue of the film is a ticking clock on the wall. It's the exact same clock as the one Cheryl is drawing in The Evil Dead (1981).
To get into Ellie's alternate personality, Alyssa Sutherland took inspiration from Jim Carrey's performance as Stanley Ipkiss in The Mask (1994).