• Some doors should never be opened
  • One night can cost you everything.
  • One night can cost you everything


  • Keanu Reeves previously starred in Speed (1994), and Colleen Camp appeared in its sequel Speed 2: Cruise Control (1997).
  • Keanu Reeves and Ana de armas previously have worked together in "EXPOSED".
  • Aaron Burns, Ignacio Allamand, and Lorenza Izzo also appeared in The Green Inferno (2013).
  • 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.
  • Eli Roth's wife Lorenza Izzo portrays Genesis.
  • The Taiwan Chinese title translates to "When Babes Come Knocking".
  • 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.
  • 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.


  • Crew or equipment visible: Just after Genesis gets up to go to the bathroom, Evan also gets up to shut off the record player. As he passes Bel, a cameraman is visible in the reflection of the glass.