Factual error: The Robin that comes along in the movie is an American Robin, not a British Robin.

Mary Poppins (1964)
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Directed by: Robert Stevenson
Starring: Julie Andrews, Dick Van Dyke, David Tomlinson, Glynis Johns
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Bert: Speaking of names, I know a man with a wooden leg named Smith.
Uncle Albert: What's the name of his other leg?
Trivia: The voice of Mary Poppins' parrot head umbrella is David Tomlinson (Mr Banks).
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.