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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More mistakes in Mary Poppins
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: This was Julie Andrews' film debut. Her role won her an Academy Award for Best Actress.
More questions & answers from Mary Poppins
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