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Knock Knock (2015) Poster

(I) (2015)

Trivia

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Colleen Camp and Sondra Locke, two of the producers of this movie, starred in Death Game (1977), the original movie, on which "Knock Knock" is based.
Eli Roth's wife Lorenza Izzo portrays Genesis.
This is the first official remake of the psychological thriller Death Game (1977), but there is also a much older unofficial remake of that movie--the Spanish erotic thriller Vicious and Nude (1980) (a.k.a. "Vicious and Nude") with Jack Taylor, Eva Lyberten, and Adriana Vega.
The Taiwan Chinese title translates to "When Babes Come Knocking".
At some point in the movie, Genesis writes "it was NOT a dream" on a mirror, but the colored shirt she wears reads: "it was all a dream".
Monkey, Evan's pet, is a French Bulldog.
Aaron Burns, Ignacio Allamand, and Lorenza Izzo also appeared in The Green Inferno (2013).
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Keanu Reeves previously starred in Speed (1994), and Colleen Camp appeared in its sequel Speed 2: Cruise Control (1997).
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Spoilers 

The trivia item below may give away important plot points.

At the very end of the film, Genesis and Bell take Evan's beloved family dog, Monkey. In John Wick (2014), John (Keanu Reeves) goes on a bullet filled rampage, after his cherished dog is unnecessarily killed by thugs.
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