Netflix acquired the distribution rights for this film from Paramount, when the studio reportedly couldn't figure out how to market the film.
Dr. Horn's former patients are named after characters in horror films: Perry Hobbes after Detective Hobbes in Poseídos (1998), Agnes Thorne after Damien Thorn in La profecía (1976) and Lucius Woodhouse after Rosemary Woodhouse in El bebé de Rosemary (1968).
Lead actor Charlie Shotwell was 10 years old when this film was shot from late January to March 2018.
The mansion is based on the Beauregard Parish Jail in DeRidder, Louisiana.