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.

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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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).
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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