Other mistake: In the intro to the Pastoral Symphony, the narrator identifies the deity who cloaks the world with Night to be Morpheus, who is the Greek god of sleep and dreams. However, the character in the animation is fairly obviously female, with long hair, eye shadow, and lipstick. My theory is that the character was intended by the art team to be Nyx, the Greek goddess of Night. Night would be a more likely candidate to be making it nighttime across the world, while Morpheus would be more likely to put people to sleep or send them dreams.
Suggested correction: Without further evidence/proof, this theory remains just that. A theory.
Continuity mistake: When Pinocchio is locked up in the cage of Stromboli, Jiminy goes inside the cage lock, and he hangs his coat and hat on the outside of the lock. In the next shot, they have disappeared.
Continuity mistake: When Daffy Duck persuades Porky Pig to quit in order to pursue a career in feature films as Bette Davis' leading man, there is a coat hook on the wall that keeps disappearing and re-appearing between shots.
Continuity mistake: When Goldilocks arrives at the Three Bears' house, there are hinges on all three doors, but in the next shot the hinges on Mother Bear and Baby Bear's door have disappeared.
Continuity mistake: When Donald Duck relaxes in his folding chair, you can see his hat is on his lap, but when the chipmunks run up to him, the hat has disappeared.
Continuity mistake: When Elmer first sees rabbit tracks, there are two big tree trunks in the background, but when we cut to Elmer in the next shot, the trunks have disappeared.
Continuity mistake: When Elmer is reading his book at the beginning of the cartoon, you can see it reads "How to Photograph Wild Life" on the spine, but when we see Elmer in the next shot, the words have gone.
Continuity mistake: After Mickey hides Pluto in his suitcase in Burbank, Mickey picks up his cane and runs to the train, then when Mickey actually jumps onto the train caboose he's only carrying his suitcase, he does not have his cane, nor does he have Pluto's suitcase (which had been filled with bones) with him. The cane reappears on the train later, and at the end Pluto's suitcase mysteriously reappears when Pete throws it at the duo in Pomona.
Continuity mistake: After the mouse is revived by water from Jasper, he goes up to the cat and you can see that the mouse's left hand is under Jasper's mouth, but in the next shot his hand is now near the whisker area.