Revealing mistake: When all four actors are up on the rooftops, look closely at them when they all step onto the smoke platform that brings them down. All four actors are doubles. (01:46:50)

Mary Poppins (1964)
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Directed by: Robert Stevenson
Starring: David Tomlinson, Dick Van Dyke, Glynis Johns, Julie Andrews
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George Banks: Kindly do not attempt to cloud the issue with facts.
Trivia: This was Julie Andrews' film debut. Her role won her an Academy Award for Best Actress.
Question: Does anybody know how they did the scene where Mary Poppins is doing a duet with her mirror image?
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Chosen answer: They recorded her singing in two separate parts and fixed them together. The editors did a good job on it! It may have been made a long time ago but even then the technology was quite advanced enough to carry out that scene.