Revealing mistake: When the elephants are making fun of Dumbo in the train caboose, Dumbo's mother pulls a pin which causes the stall door above the other elephants to fall. When the door bounces back up, you can see that the animators forgot to draw the elephants' heads and trunks and only their bodies are visible.
Continuity mistake: After the crocodile scene, Lady and Trump jump away and land on a narrow street inches away from the hyena cage. After the hyena stops laughing, the place is completely different: Wide and with a fountain in the middle. Lady is sitting still so they couldn't have gone somewhere else in between shots.
Continuity mistake: Angelica has flowers on her dress. During the wedding, they disappear and reappear between shots.
Continuity mistake: During "Eyesight to the Blind," The Preacher's guitar changes from a red Les Paul to a black Stratocaster. It's not blatantly obvious, but easy enough to spot without slow-mo. (00:26:33 - 00:30:02)
Continuity mistake: While Eddie performs "Hot Patootie", he's seated on the motorcycle with Columbia for a bit, and when Eddie stands up he's holding the mic in his left hand, but as he walks up the steps it's in his right hand, then next shot when he's facing Frank-N-Furter the mic is in Eddie's left hand, and next shot it's back to his right hand again.
Continuity mistake: When Jean Valjean is telling Marius that he is leaving and who he is, a large armoire appears behind Marius and then disappears in the next shot. (02:15:20)
Continuity mistake: After Capt. Hook drops Jane into the water and Pan dives in to save her from the octopus, he begins to gloat. Looking at his scabbard there is no sword because he threw it at the mast to cut the rope. Next thing you know, the sword is back in the scabbard.
Continuity mistake: When the Dowager Empress is walking towards the door and says the cinnamon smell is from an oil, her reflection in the mirror exactly matches her movements, including when she turns, when it should show a mirror image. Note the blue sash is on the same side in both. A quick reflection of Anastasia's head just before when she says "I just want to know who I am" has the same problem. After they sit the reflections appears to be right. (01:09:40)
Continuity mistake: After Jack is blown out of the sky and is lying in the graveyard, he has several grey smudges on his face from the explosion. But in the very next shot, a bird's eye view of Jack lying across the angel, the smudges have disappeared. (00:59:10)
Continuity mistake: When Mary reads the measuring tape after measuring herself the message reads up and down (as shown to the audience), but then the camera shows Mary reading it side to side.
Revealing mistake: During the "Outfox the Fox" number when Hawkins "cuts" the copies of himself in half, the copies are obviously all grown men, which then obviously become little people standing on each others' shoulders; it's easy to tell where the cloak hems of the little people on top end. (00:09:00)
Other mistake: At the very beginning, when the lights rise above the cast you can see they're all equally spaced out and the light has the same brightness for each character. At the end of the song, the camera shoots to the back filming everyone from behind, note Mark, he's crammed in the corner next to Angel with out the same amount of space originally he started with and his light is very dim compared to the seven others. (00:02:45)
Visible crew/equipment: When Mitchie is at her locker at school, Sierra walks up to her and there is a white chalk marker line on the floor that she promptly steps on to speak to her friend.
Continuity mistake: When Don is caught by the cop while splashing around in the puddle during "Singin' in the Rain", Don's left hand jumps from his umbrella handle to down at his side between shots.
Continuity mistake: A spider web drawn by a girl near the fence disappears.
Continuity mistake: When Pocahontas sees John Smith for the first time, John is climbing up a cliff face and then a tree. You can see his musket strapped to his back as he's climbing. But after he tells Thomas he's getting a better look and then is shown in the tree, his gun has vanished.
Revealing mistake: When Jimmy and Millie are sitting on the ledge of the building she works in, Jimmy leans forward, and the top of his head disappears - or actually fades into the background.
Other mistake: When the Grinch rides his sleigh back to Whoville and returns everything, as the narrator says, "He brought back their pantookas," a pink ornament lands on the Christmas tree, then changes to yellow mid-shot.
Deliberate mistake: When the gangs meet in the toilets to set a date for the brawl, the mirror on the left is the only one opaque, most surely to avoid reflections of the filming crew.
Continuity mistake: When the movie ends and Aladdin exits the palace the passers by behind are not continuous between shots, check the woman in a salmon coloured sari, for example, who walks by twice.