The classroom scene that takes place toward the beginning of the film was inspired by a similar scene in the 1989 horror film After Midnight.
The devil mask in Encyclopedia Satanica was sculpted and painted by Justin Mabry, one of the co-founders of Trick or Treat Studios. Due to time constraints, Justin used a Jack Nicholson's Joker sculpt he had done as the face and added horns, eyebrows, sharp teeth and a goatee to the final sculpt.
The character of Trevor from the segment "Encyclopedia Satanica" was a woman in the original draft of the script.
P.J. Starks' (who was a writer, director, and producer for the film) face appears on the can of Ka-Pow! in the segment "A Little Pick Me Up"
In "Encyclopedia Satanica" in the scene where Paige is putting books away a poster can be seen advertising a screening of the classic 1962 horror film "Carnival of Souls." Co-writer/director Nathan Thomas Milliner felt the image from the film (a woman being watched by a haunting male figure) echoed the scene as Paige is also being watched and haunted in this scene.