During the film's crowdfunding campaign on Kickstarter, backers were able to vote on the design of each monster and the winning choices were used in the movie.
As part of the film's crowdfunding campaign prior to production, the identity of Carl played by Arron Dennis was decided by a vote. Backers of the campaign had the choice of making the character either a Pizza Delivery Guy, Neighbor, Police Officer, Religious Preacher, Door to Door Salesman or Stripper-gram, with the latter being the winning choice.
The scene where the police car arrives at the house was a late addition to the script and was shot six months after principal photography ended. Due to cast availability, writer Paul Butler took on the role of the Slasher monster.
The chainsaw prop used by Sophie was non-functional and lacked a start chord. Whenever actor Lyndsey Craine pulls on the chord to start the chainsaw, she is actually miming the action. Sound design and visual effects were used to make it seem like the blade is spinning.
For the ghostly whispers which can be heard when the book is opened, actress Julia Munder was recorded whispering random lines from the film's script in multiple languages including English, German and French.