The photo Nat unwraps is actress Megan Purvis' real mother.
The 'Shaky-Cam' shot over the car was operated by the two directors.
The character, Blackwood, is a possible reference to author, Algernon Blackwood, who wrote the novella Wendigo (1978).
Very short after-credit scene is shown.
The other patients in the hospital at the start of the film are played by members of the crew.