Continuity mistake: When Cary Grant tells Deborah Kerr to keep the door closed, she is holding a record album. As a reaction to his directive, she lowers the LP to about waist level. The camera shot changes and she's holding the LP higher again.
Continuity mistake: When Deborah Kerr and Cary Grant are talking after he is shot, she is sitting with her hands folded over her knees. The shot changes and she's suddenly gestering with her hands, then she folds them over her knees where they were.