Revealing mistake: When the train plummets into the basement, the windows never seem to smash nor crack, nor does the paint on the train ever seem to scratch the slightest bit. (01:34:15)
Revealing mistake: When Alex says they should go find the penguins, he says "To home" and Marty, Melman, Gloria and Julien place their hands on top of his hand. In the next shot it shows all of them together. But due to the position of Julien and his arm length, it would have been impossible for Julien to have his hand fully placed on Alex's hand. (00:05:05)
Revealing mistake: When Scrat removes the giant acorn in Scratlantis the city is immediately flooded. Everyone in the background is blown away by the sudden rush of water. However, both Scrat in the background and Scrat's host (slightly off-camera) in the foreground don't move and don't seem to be affected by extremely strong flow. (01:18:50)
Revealing mistake: When Snow White rides the white horse bareback to the dark wood. In the last few frames as the horse gets trapped in the mud you can see a very thin set of reins attached to the horse's head.
Revealing mistake: When there is a flashback of Thorin in the war, in the first few seconds, on the left of the screen, there is a man with a shield. He swings it at an ogre and you can see it misses by a good five inches, but the ogre moves his head back as if it were hit.
Revealing mistake: During Jack's memories, when he is holding the antlers up to his head, Jack's sister's boot can be seen coming through the fabric of her dress.
Revealing mistake: In the lead up to the final scene, prior to the cranes being in alignment, when Spider-Man is jumping between buildings, he falls down to a fire escape, and you can see that the bars or rails on the railing he lands next to are not made out of metal as they easily move as the actor or stuntperson moves next to them. (01:48:42)
Revealing mistake: Just the bridge is blown up at the start, you can see all the soldiers have been replaced by dummies. (00:12:10)
Revealing mistake: In the final battle scene, when Edward does a flip around (and then breaks someone's head off), as he flips, you can see that the stunt double doing the flip looks totally different - taller, thinner, lankier, different face and hair.