Directed by: Frank Capra
Starring: Cary Grant, Raymond Massey, Jack Carson, Priscilla Lane
Character mistake: The plain clothes officer who arrives is referred to by his officers as "Lieutenant", but Mortimer calls him "Captain" more than once.
Suggested correction: This is a holdover from the play, where Mortimer makes that mistake and the lieutenant has to correct him.
Continuity mistake: When Mortimer discovers the body in the window seat his hair changes from being flipped over his forehead to being neat and then back again without any obvious motions that would have changed it.
Elaine Harper: But Mortimer, you're going to love me for my mind, too.
Mortimer Brewster: One thing at a time.
Trivia: The character of Jonathan is referred to several times in the film as a thug who "looks like Boris Karloff." This was an in-joke referring to the fact that Karloff played the role of Jonathan in the original Broadway production of Arsenic and Old Lace..