Trivia: In the 40th anniversary re-mastered edition they have used Audrey Hepburn's original singing track for the "Wouldn't it be lovely" song.
Trivia: It was during the filming that Elvis first heard of The Beatles when someone had their first English LP on the set. He took it into his room and listened to it for hours. He then banned their music from the set.
Trivia: Hitchcock's cameo comes five minutes into the film - he is entering from the left side of the hotel corridor after Marnie walks by.