Audio problem: In the French, German and Spanish version, in the song Supercalifragilisticexpialidocious, before Mary Poppins says the word backward. While Mary and Bert sing in the dubbed version, in these three languages, you can hear the English version in the background. You can hear it louder in the French version.

Mary Poppins (1964)
1 video
Directed by: Robert Stevenson
Starring: Julie Andrews, Dick Van Dyke, David Tomlinson, Glynis Johns
Continuity mistake: At the bank where the elder Mr. Dawes appears from the back room, he makes it as far as the edge of the step in that shot. In the next shot, he's back by the door walking again to the edge of the step.
George Banks: Kindly do not attempt to cloud the issue with facts.
Trivia: The voice of Mary Poppins' parrot head umbrella is David Tomlinson (Mr Banks).
More questions & answers from Mary Poppins
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Chosen answer: For a good explanation, go to The Straight Dope: http://www.straightdope.com/mailbag/msupercali.html. It will give you pretty much everything that is known about this odd word.
Richard Welty