'Knock Knock' trivia and fun facts

Wife Lorenza Izzo is director Eli Roth's wife.

Title The Taiwan Chinese Knock Knock s title translates to "When Babes Come Knocking".

Remake Knock Knock is the first official remake of the 1977 psychological thriller 'Death Game', but there's also a much older unofficial remake of that movie - the 1980 Spanish erotic thriller 'Viciosas al desnudo' (1980).

Dog Monkey, Evan's pet, is a French Bulldog.