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: Once Spunky is kidnapped and Hunky takes off chasing the truck, you see the truck going along the road passing just some grass and one large rock on its left side. Once Hunky catches up to the truck, it cuts to a side view close up of him and Spunky's head sticking out the back, and suddenly the truck is passing a very large rock that was not there in the previous shot. The rock is taller than the truck, so it would have shown. And then it's very obvious the background is then looped as the same huge rock passes the truck every few seconds repeatedly. (00:01:35)
Continuity mistake: When Porky parks his car after the security guard spots him wearing an Oliver Hardy disguise, he jumps out of the car and the door is shut. When Porky sees the security guard after being thrown out of the shooting of the ballet film, he runs back to his car and the door is now open.
Continuity mistake: When Elmer places the carrot by Bugs' home, the rabbit tracks around the hole keep disappearing and re-appearing between shots.
Continuity mistake: When one of the chipmunks takes some of Donald Duck's food, you can see there are eight items. But when Donald chases him after hitting him in the face with a banana, there are now five.
Continuity mistake: When Mickey hides Pluto in his suitcase, the entire handle to the suitcase breaks off and Mickey tosses away the handle. This handle reappears unbroken when Mickey takes Pluto out of the suitcase and then quickly hides him again, though it's broken again in following shots. Then at the end, when Pete tosses both suitcases off the train Mickey's suitcase has the broken handle, but when it lands on Mickey and Pluto the handle reappears unscathed once again.
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 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.
Continuity mistake: When Papa Bear is drinking from the hot water tap after eating the hot porridge, the tap handle changes position between shots.