Ari Millen, who plays Michael, played the same role in the play that he does in the feature film.
Coal Campbell, Nicholas Campbell's actual son, plays him as a younger man in the film.
Amos Crawley, who plays Thomas Coward, was the director of the play at the Fringe Festival (2013).
In a Q&A session, writer Peter Genoway said that the original draft of the script, dated 2010, had the title 'Elk Lake'.
Bar sign on the wall next to the phone states: BAR PHONE FEES - $1 - On his way out / $2 - Just left / $3 - Not here / $4 - Haven't seen him all day / $5 - Who? / Make arrangements with bartender upon arrival