The kid with the hat covering his face in the first classroom scene is director Ryan Sheets playing his fourth role of the film. He also plays Paul, The Skeleton, and The Pumpkin Man.
Multiple times throughout the film, 'Lil Boo' a pumpkin from Halloween Horror Nights can be seen.
The song Inside the Machine in the end credits was licensed as a tribute to Halloween Horror Nights at which the song was also played.
The clown seen in the selfie videos is Kreepy the Clown from the original short films.
The name Hank Carver is a reference to The Wicked Growth Realm of the Pumpkin from Halloween Horror Nights. His pumpkin patch says it was established in 2016 which is the year the first Pumpkin Man short film was released.