Continuity mistake: Myra Bruhl is popping pills at the beginning of the movie; when she puts down the container, there's a white-labeled bottle on the bedstand that was not there before. (00:02:40)
Deathtrap (1982)
Ending / spoiler
Directed by: Sidney Lumet
Starring: Michael Caine, Christopher Reeve, Dyan Cannon, Irene Worth
Clifford and Sidney kill each other. Helga steals Clifford's script and claims she wrote it. The play is a huge success.
Lifesava
More mistakes in Deathtrap
Myra Bruhl: Well, have you thought about collaboration?
Sidney Bruhl: I don't want any help in killing Clifford Anderson. I want to strike the blow myself.