Continuity mistake: Near the beginning Harriet Vane produces tokens for herself & Lord Peter Wimsey of miniature handcuffs with one cuff "open to symbolise we're giving up on crime". She puts hers on as a bracelet. Immediately after & several times throughout the film it's clear hers is a set of closed handcuffs.
Busman's Honeymoon (1940)
1 mistake - chronological order
Directed by: Richard Thorpe, Arthur B. Woods
Starring: Constance Cummings, Robert Montgomery, Leslie Banks, Seymour Hicks
Harriet Vane: May I ask what is your motive for liquidating this little animal?