Revealing mistake: Cary Grant shows off his ice skating moves but you can tell it's a stunt double. The double is a bit shorter than Grant. Also in the same sequence, the two other skaters have noticeable doubles as well.
The Bishop's Wife (1947)
1 revealing mistake
Directed by: Henry Koster
Starring: Cary Grant, David Niven, Loretta Young, Monty Woolley
Continuity mistake: When Dudley drafts the sermon he says "you give me a tie, I give you a book." When the bishop reads the sermon he says "you give me a book, I give you a tie."
Henry Brougham: Are you expecting a letter?
Dudley: Well, you never know. If I did get one, the stamp would certainly be worth saving.