Continuity mistake: When Kronk is disposing of the llama body, he runs down a very tall staircase. At the bottom, he runs into two peasants and leans up against the wall. The peasants pass him, walking toward the left side of the screen. Immediately after they disappear from the screen, the "camera" zooms out so you can see the entire palace. Now, the only place the peasants could have gone was up the staircase Kronk had just come down from, unless they wanted to fall off a cliff. If you look on the stairs, though, no one is there. The peasants couldn't have made it all the way up the extremely tall and steep staircase within seconds, so they just mysteriously disappeared.
Revealing mistake: When the Pterodactyl is flying around with the egg, its shadow isn't cast as she flies over the trees.
Continuity mistake: When the elephants in the circus are making a pyramid on top of a ball, as it changes from shot to shot the colour of the blankets on their backs changes, and one of the elephants changes from grey to blue.
Continuity mistake: In the scene where Chicken Little lends the alien baby, Kirby, his handkerchief, after Kirby blows his nose, it sticks to Chicken Little's hand. Chicken Little then wipes the hanky off his hand on to the grass. In the very next shot, the hanky has disappeared, and never shows up again.
Revealing mistake: The stepmother's arm disappears for a split second when she tells her daughters that there is still a chance for them to become the princess.
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.
Continuity mistake: Lady is put in her bed and the master leaves the kitchen but he goes back in and puts a newspaper on the floor and leaves again but Lady gets out of her bed so the master comes back once more and puts her back in her bed but the newspaper on the floor has vanished.
Continuity mistake: The scene where Col. Hathi inspects his troops, he leans on his stick and it breaks. However, in the next scenes, the stick you see is sometimes broken and sometimes it is still complete.
Continuity mistake: When Dr. Doppler and Jim first observe their ship, Dr. Doppler is right next to Jim when he points it out. When the shot changes to a long shot, they're much farther apart. (00:16:55)
Factual error: During the song "A Guy Like You," one of the gargoyles trips the trapdoor on Quasimodo's miniature hangman's scaffold. Trapdoors weren't used on scaffolds until the 18th century.
Continuity mistake: In the scene where Dr. Dawson and Olivia are seeking Basil's help at his house, Basil sits down and starts playing the violin, holding it in his right hand and having the bow in his left. When Basil the stands up in another shot, he is holding the violin in his left hand (like it's supposed to be) and the bow in his left.