Was filmed in the perspective of the characters by using POV camera shots for the entire running time.
Was originally intended to have a running time of 4 minutes but the filmmakers kept adding twists or more filming dates while editing. The final running time is 13:21.
The make up added to the Willie character took 45 minutes to apply and only appears in the film for 2 seconds.
Has an extra 2 minutes of footage that explains the character of Willie after the ending credits.