Roy Mehaffey was the only trained actor on set, yet had no lines in the movie.
When pricing how much it would cost to make the movie, W. Martin Hill had quoted $1000 for the (what they were told would be) 10 day shoot. It ended up taking 60 days.
Over 15 gallons of blood was used in the making of the film.
The script actually contains pages saying a scene was to be improvised with absolutely no other direction.
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