Other mistake: When Ringo and the young boy with the tire walk along the path together and the boy asks Ringo, "Why aren't you at work?," you can see Ringo mouthing the line along with him.
Other mistake: In the ceiling tea party, Mary Poppins offers Bert some sugar, and when he responds that he would not like any, his Cockney accent is gone.
Other mistake: Subtitle (English) appears to be incorrect: "He is setting the scions of criminal investigations back 1000 years" should be "He is setting the science of criminal investigations back 1000 years." "Scions" is a description of the branches of a tree. (01:11:00)
Other mistake: When Col. Bat Guano shoots the Coke machine and it squirts him in the face, he's holding his head too high. You can see that he first gets the spray on the chin and then he ducks down to take it full in the face. (01:09:50)
Other mistake: Johnny Brown is serenading Molly in the meadow as she sits up on the branch of a tree. In shots where we are looking down on Johnny (from over Molly's shoulder), the shadow of the canopy that protects the actors from the sun can be seen as a perfectly straight line on the ground, behind Johnny. The shaded/unshaded areas move as the canopy shifts in the breeze.
Other mistake: Mrs Kenton and Sylvia can't get into the study where Mr. Kenton is; there is no reason why the door would be locked. A mule can't lock it with a key and there is no debris or furniture to block the door. Harold opens it just fine from the inside without operating any particular kind of lock.
Other mistake: When our heroes are on the conveyor belt in the rock-processing plant, none of the rocks are larger than two feet in size - especially having gone past a set of spinning saw blades - and yet they get sprayed by two steam nozzles, the highest of which is about six feet in the air, and the lowest is about four feet in the air. Clearly neither of these nozzles would have any practical use. (01:21:10)
Other mistake: When the Big Bad Wolf is demonstrating to Bugs how to ring the bell properly (so the trap works), his hand lands on the side of the bell instead of the top, yet the trap still works and the bell still dings.
Other mistake: When Charles is buying the car, he says to the dealer, who knows Charles very well, that the phone should be on the left, and the dealer, who knows what's coming, says of course, and agrees that it must be done before delivery tonight. When the car arrives, the phone is still on the right.