Other mistake: When Derek and co are 'shooting' the musicians dressed as animals, Derek shoots at his foot to show that they are harmless. AS the arrows are covered in red powder, surely his foot would go red? After all, every shot at the musicians made them get a red mark.
Other mistake: During "Can You Feel the Love Tonight?", Simba's reflection in the water isn't very consistent - the rocks he's standing on are much closer to the water than they appear in the reflection. (00:58:45)
Other mistake: Near the beginning, when Abis Mal is catapulted by Iago, he is launched in a lobbed way but, strangely, he flies straight to the thieves.