Corrected entry: When Bert is dancing with the penguins you can tell that he didn't just pull his pants down, they were sewn together, there is a vast difference in the distance between the waist and inseam in the two shots. But in the shot when he 'pulls them back up' you can still tell they're sewn together until when he runs to the other side of the table and his pants are back to normal. This isn't because of Bert's 'magic', just poor continuity.
Corrected entry: The story says that Mary Poppins comes to help Mr. Banks fix his flaws as a father. Although during the song, "A Man Has Dreams", it's actually Bert who makes Mr. Banks realizes his flaws rather than Mary Poppins, and even in the story Mr. Banks says that Mary Poppins made everything worse for him, so actually Mary Poppins isn't the real hero in this story, it's Bert.
Corrected entry: Towards the beginning of the movie, when George Banks comes home from work (clocking off at 6pm), the grandfather clock is a minute after 6pm and he sings a little ditty. Yet later in the movie, when Mr Banks is called to the bank by Mr Dawes, the route that he takes to get there is so long that there's no way he can make it to be home to "pat [the kids] on the head and send them off to bed" at 6:03 as he sings in the song.
Corrected entry: When Burt and the fox ride onto the horse racing track, the horses all rush past him, spinning him around. But if you look closely, when he spins around, he spins the wrong direction; he spins as if they all ran behind him when the all ran in front of him.
Corrected entry: At the beginning when Mrs. Bank is talking to Katie Nanna you can see the clock behind her and you can clearly see that the time is 6:30 when a little later it is at 6:00.
Corrected entry: Some of the rockets in which the captain's assistant puts into the cannon have duct/masking tape around them. Duct/masking tape wasn't invented then.
Corrected entry: As the movie starts out, the mother is going to suffrage meetings (to fight for the right to vote), setting the film in the early to mid 1910's. When they're talking about getting a new nanny, the mother gets a modern ring binder out.
Corrected entry: In the shot where the children first bring Mary up to her room, she puts her carpet bag on the table to take all of her things out of it. While she is removing all the things from the bag, you can see that Jane's dress above the table is different from her dress below the table.
Corrected entry: When they get onto the roof of their house and start walking, they are shown as being a very long way away from St Paul's, much further than Mr Banks might expect to walk to work without taking a cab...