Trappola mortale

Director Sidney Lumet once commented on the real stage-play scenes seen in this movie: "We used the original set of 'Deathtrap' as our set for Sidney Bruhl's flop play. The Music Box (Theatre) is dark on Mondays, so we shot there on a Monday, along with six hundred dress extras as first-nighters. Thus, the opening scene is a movie of a play-within-a-play which takes place within the play on which the movie is based. If that's not completely clear, it's at least a 'first'!"

When Sidney has the Deathtrap script and threatens to throw it into the fireplace, the fire isn't lit.

Murderous weapons by Eoin Sprott.

CBS added 4 minutes to this film for its 1986 network television premiere.

Featured in Sneak Previews: Porky's/El Salvador: Another Vietnam/Das Boot/Deathtrap/Richard Pryor: Live On The Sunset Strip (1982)