Continuity mistake: In the scene where the two kings are fighting, one of them pulls a swordfish from the table and after they calm down sticks the fish in his belt. In the next shot the fish has disappeared.
Continuity mistake: In the scene at the college where Callaghan asks to look at Hiro's Megabot, Callaghan's shirt is blue, but when he holds out his arm to take Megabot, his shirt sleeve is red. Later on he is wearing a red shirt at the SFTT. (00:13:30)
Continuity mistake: In the scene where Quasimodo is reciting his alphabet to Frollo, we see Frollo pick up his goblet for a drink when he says "D?" By "E?", he still has the goblet in his hand. After saying "F?" he raises the goblet and takes a drink. When the camera pans back to Quasimodo saying "Festival", the goblet is in clear sight even when we hear Frollo spit out his drink.
Continuity mistake: When Taran, Princess Elonwy and Fflewddur try to escape from the Horned King's castle, Taran opened the gate by removing the chains. The next shot the gate is closed and chained, the last shot the gate is open again, and the boat is pushed trough by Taran. (01:06:33)
Continuity mistake: At the beginning, when Penny and Bolt are acting out the chase scene on the playback monitor, the producers are enraged over a boom mic showing up in the shot. Yet seconds earlier during the actual scene, you don't see the boom mic in the upper right corner. (00:10:10 - 00:11:50)
Continuity mistake: When Aladar is trying to help Eema get up, his eyes turn blue in one shot and in the next, they turn back to the usual green. The same thing happens at the end of the movie, when Aladar's baby hatches out of the egg.