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 More quotes from Mary Poppins More trivia for Mary Poppins More questions & answers from Mary Poppins
Mary Poppins: We can't have them gallivanting up there like kangaroos, can we?
Trivia: The voice of Mary Poppins' parrot head umbrella is David Tomlinson (Mr Banks).
Question: How did they film the shot with the different colour medicines coming out of the same bottle?
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Answer: Most likely a variation on the "inexhaustible bottle" magic trick which has existed in various forms for hundreds of years - it relies on different chambers holding different liquids, and air holes in the bottle being covered or not change the pressure and allow the desired liquid to flow out. As the scene is one continuous shot with the entire bottle visible, this seems most likely - the air holes could be on the side away from the camera, with Julie Andrews repositioning her thumb for each colour. More info here: https://en.wikipedia.org/wiki/Inexhaustible_bottle.
Jon Sandys