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Continuity mistake: When Mary Poppins starts to read the "qualifications", the paper she reads from is whole, with no kind of indication that it had ever been torn. After a quick cut to George and back to the paper, the closeup of the paper reveals the lines where it was torn. Also in this scene, when she comes in, she has white gloves on. In the closeup on the paper, the gloves are gray, and a few shots later, they're white again.

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Continuity mistake: As Banks realises what the phone call is about, Bert is picking up the last brush. A moment later, he picks it up again.

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Revealing mistake: As the squirrels play around Bert and Mary, the background can be seen through their tails. (00:45:25)

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Continuity mistake: When Mary holds up the paper, it appears whole, but in close up, the places where it was torn are visible, then whole again.

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Question: If the children had run after the kite, and were on the other side of the park, how did they know that Katie Nanna was gone?

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Other mistake: As Admiral Boom's assistant is loading the cannon a third time, he puts the red rocket in nose first rather than stick first.

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Other mistake: When Admiral Boom orders the gun to fire on "the Hottentots" (the sweeps) the rockets sticking out are in the order of a small red on top, a large green in the middle, and a large red on the bottom. A moment later, he orders another salvo, but the rockets are in the same arrangement. The chances of the arrangement being identical twice, unless done carefully, are very slim.

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Other mistake: After Bert and the others dancing on a railing that should have moved, as it did when they jumped off, three sweeps walk back and forth on their hands over the street between buildings. After dropping to only their toes to hold them up, you see them drop all the way down, then stand, where there was no surface in sight to do that on.

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Visible crew/equipment: As Mary walks back to sit down the shadow of the camera is on her back.

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Revealing mistake: As the sweeps dance and jump from building to building, the edges of the matted in street that hides the sound stage floor is easily discernible.

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Revealing mistake: In the scene with the three chimneys, the sweep coming out of the middle chimney can be seen actually coming up from behind it, as his arms going up are visible.

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Visible crew/equipment: As all the sweeps come out of the chimneys, the wires holding them are visible.

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Visible crew/equipment: As Mary Poppins gets to the top of her exit from the chimney, the wires holding her are visible. And as Bert lands, his wires are visible.

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Revealing mistake: After Bert pulls up his pants to bring the dance challenge to an end, as he walks to the other side of the clearing, both he and the background can be seen through the penguins.

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Continuity mistake: As the Penguins answer the call, and are setting up the table, Bert is laughing and leaning in, and a second later, he is upright and all the way back in the chair.

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Revealing mistake: As Mary and Bert sit at the Penguins' tea tent, when Bert calls for the waiter, the background shows through his head, revealing the live action matted in over the animation.

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Revealing mistake: As the turtle closest to the camera struggles with Bert's weight, Mary's heel clips through the turtle's beak. Also, though a combination of animation and live action, neither Bert or Mary has any kind of reflection on the water, real or otherwise.

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Visible crew/equipment: As Mary Poppins walks over to put the hat stand in place, the shadow of the camera plays on her dress.

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Revealing mistake: When Mary Poppins goes to bring out the hat stand and the mirror, you can tell that the underside of the table is masked with a overlap of the background to make the illusion complete. Also, when she pulls out the mirror, watch the table leg closest to her, and the bottom of the mirror pass, because the illusion is not quite far enough to cover it.

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Continuity mistake: When Admiral Boom makes his appearance, and asks about the time gun, he states "Three minutes and Six seconds" until the hour. However, the argument between Katie Nanna, the maid and cook, and Mrs. Banks' "Sister Suffragette" number, and Nanna's announcement of departure take a total of five minutes and ten seconds until the gun is fired.

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