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: After Mortimer picks up Elaine and literally throws her out the front door, he locks it to make sure she doesn't just open the door and walk in again. When Aunt Abby goes to open the door for Mr. Gibbs less than a minute later, she doesn't have to unlock 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..