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.