The copyright year under the title is given as 2022, though the filming wasn't completed until Dec 2023. It was only the intended release year but the project got delayed.
The title was borrowed to the lost 1915 movie of the same name directed by Tod Browning, but shares no elements of the plot.
Dr Maxwell's character was named after Bill Woods' character in the 1934 movie "Maniac" directed by Dwain Esper.
A model house was built with plaster and little stones.