Continuity mistake: When the movie begins the smallest boy holds a neat pile of towels. When the shot changes they're messed up. Then they swap back to neat. (00:08:15)
Other mistake: The aged children from the first movie find the old kite and Michael decides to throw it away, setting in motion the titular event of this movie. Problem is, the yellow border here is neat and along the whole perimeter, while in the iconic finale of the previous movie, one side of the lozenge was patched up with newspaper. (00:18:45)
Other mistake: The snow globe from the original is in the loft in the new film, but in the original film, as Mary was leaving the Banks house while they flew a kite, she packed it in to her carpet bag.
Other mistake: As established in the original and this film, when the Admiral fires his cannon, everything in the house falls off walls and mantles, and everything needs to be caught to prevent them from being damaged. However, when he fires his cannon as Mary Poppins and the children are going out to have the bowl repaired, Michael has already left for work, Jane and Ellen are standing outside, and Mary, the children, are getting onto Jack's bike - leaving no-one in the house to catch the falling objects which would therefore all be smashed or damaged.
Continuity mistake: After Jane bumps into Jack a paper appears/disappears on the road.
Factual error: When Mary and the children go to the bank the long shot of the bank shows a statue that was not erected until 1994.
Continuity mistake: When Jane bumps into Jack her papers fall to the left. When the angle changes they're falling again but none to the left.
Continuity mistake: During the tub scene John has foam on his left cheek, but before the dolphins appear a back shot shows foam all around his face. Also, when the dolphins jump over the boat foam suddenly appears on the right side of his body.
Continuity mistake: When Mary is about to dive in the tub she carries the shampoo bottle with the label unseen. Then it cuts to a closeup of her placing the bottle on a shelf and the label is visible. Angle changes and the label disappears again.
