Trivia

No visual FX were used, except for the removal of wires and rigs. Everything else was shot in camera.

Stephen Lang was on-set for only three days to complete shooting his scenes.

24 days of filming.

Justin P. Lange wrote the script in 10 days.

The photo attached to the file for Father Dunleavy at the end of the film is a photo of one of the one set production assistants.