Continuity mistake: The father tears the children's advert for a nanny up into 8 pieces, but when it comes out of the chimney it's in far more bits.

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: To celebrate the film's anniversary and release on DVD, there was a special screening of the film, at which Dick Van Dyke shared a humorous personal memory. On his way to the original premiere of the film, Dick Van Dyke's limousine ran out of gas not too far from the theater, so Dick himself got out and pushed the car to the red carpet.
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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