There is an unedited audio commentary track on the DVD dedicated exclusively to the original FX artist who quit in the middle of the film. In it, cast and crew share humorous stories about the lack of FX work done.
The film took a year and a half to finish principal photography due to a number of unforeseen events, including weather delays, cast members moving, and FX leaving.
There are two different barns shown in this film. The filmmakers lost access to the first barn and had to find a second barn 2 hours away in order to finish the film.
There are actually two actresses who play Isabelle Wakeworth.
The entire last act of the film had to be rewritten in order to finish the film