Continuity mistake: Throughout this movie, some of the characters from the first movie are given new scenes. The problem is that in these scenes they don't look very much like their first movie counterparts. The obvious example here is Nala when she's explaining the whole Simba VS Scar thing to Timon and Pumbaa - her face is not only a different shape, but she's a completely different colour.
Continuity mistake: While Simba and Scar do battle at the top of pride rock, Timon, his mother and his uncle take care of the hyenas. Banzai, Shenzi and Ed were also down there with Timon and Co. throughout the scene, while in the first movie the can be seen on top of pride rock while Scar tells Simba it is the fault of the hyenas, which subsequently leads to Scar being killed by the hyenas.Christoph Galuschka
Continuity mistake: When the tower of animals collapses in the "I Just Can't Wait To Be King" sequence and all of the animals are lying in a heap, the visible sable antelope is drawn incorrectly. His white facial markings that he had in the tower and when the elephant fell on his horns are gone, and he simply has a white muzzle instead. Also, the giraffe that is the middle of the heap has no horns.
Continuity mistake: When Mufasa is shown racing to save Simba and Nala from the hyenas in the Elephant Graveyard, Zazu's white underbelly has not been drawn in.