The origin of the movie came when Ant Timpson's father passed away and his father's partner thought it was best to bring him home after embalming as a way for him to spend time with the grieving family. The week was spent with the corpse in an open coffin. Then, people that he didn't know came to pay their respects to his father, sharing stories of a man that did not seem like his father.
Toby Harvard based the character of Norval on several people he went to art school with in London.
The films that influence the film; and Timpson's reasoning for them, are Snowball Express (1972) ("for the cat & mouse twists"), Sexy Beast (2000) ("for the jarring lead antagonist and turns from comedy to violence"), The Servant (1963) ("for the mindgames with those we're inavoidably [sic] linked with"), The Birthday Party (1968) ("for the pitch-black comedy of menace") and Sam Peckinpah's 1971 masterpiece Straw Dogs (1971) ("for the simmering violence awakened in the lead"). Harvard cites the plays of Harold Pinter, and Roald Dahl's Tales Of The Unexpected as influences on the screenplay.
The Cabin used in the movie is a private family residence that belongs to the owner of The Wickaninnish Inn in Tofino. It is located on private land shared by the High End Hotel and can be seen from several rooms located in the 'Pointe' Building. The cabin, beach and surrounding rainforest is inaccessible to members of the public.