Corrected entry: During the clean up of the nursery scene, a group of hats, including Jane's straw hat with the brown velvet ribbon, fly into a closet and hang on hooks. Above them is a shelf with boxes. When the clean up is complete and the children and Mary Poppins are getting ready to go out, Jane retrieves the same hat, now on the shelf instead of the hooks, and the boxes that were on the shelf are gone.
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.
Correction: While it's true that masking tape didn't exist in 1910 (it coming in the 1920s), an early version of "duck tape" was in use in America in the early 20th century. It's plausible that this was in use in London 1910 but duct tape as we now know it dates from WW2 and is different from early "duck tape".
Corrected entry: When Mr. Banks returns to the bank at night to be reprimanded, look at his torn carnation when it is placed back in his lapel. In each shot, it changes in size, shape and colour at least seven times. (02:07:30)
Correction: I have reviewed this several times and at no time does the carnation change size or shape. In certain angles it shows only a leaf with the torn blossom behind, but the color and size do not change.
Corrected entry: In the scene at the bank, twice Michael looks at his sister with a surprised and disgusted look on his face. They are the same shot.
Correction: How can you be so sure? It's not like in real life he couldn't look at his sister with the same face. People can keep the same look on their face for a long time, even if they don't intend to.
Corrected entry: Dick Van Dyke portrays both Bert and the elder Mr. Dawes.
Correction: Even if you can't tell while watching (pretty unlikely as you can easily see it's him), then he is listed in the credits.
Corrected entry: In the scene after they have finished cleaning the children's room and are leaving to go to the park, half of one of the beds is missing.
Correction: The bed that is visible is the far one (from the camera). The height of the folded bedspreads creates an optical illusion. The bedspread nearer to the camera appears to be on the farther bed, but a close look shows that it is not. The bed closest to the camera is just out of the shot.
Corrected entry: Near the end, just before "Let's Go Fly A Kite", when Mr Banks has returned home his detachable collar is detached on his left-hand side in shots from the front but not from the back of him.
Correction: There is no problem with his collar at all.
I just watched this and indeed the collar is popped out on one side.
Corrected entry: When the cook attacks the chimney sweeps, she uses a non-stick frying pan. Non-stick frying pans weren't invented until the 1950s, and the movie takes place in the 1910s.
Correction: Upon closer inspection, the pan is in fact not non-stick. But instead carbon steel, which would be appropriate for the time period.
Cast-iron would be most appropriate for 1910. Carbon steel certainly existed at the time and was used in the manufacture of high-end swords, sawmill blades, cutlery, razors and the like, but would be prohibitively expensive for the manufacture of frying pans for the general consumer.
Correction: When Jane cleans up the hats, the hat with the brown ribbon has a round top and the hats are placed in a closet that has a wall on the right side making it seem like there is space between the corner of the wall and the closet, when Jane takes out the hat, its not the same hat as the first, the hat has a flat top with a red burgendy kind of color ribbon and the closet is placed at the corner of the room.