When Timon and Pumbaa awake from their first dream home by the rocks, they look up to see the animals towering and singing "I just can't wait to be king", but their mouths don't match the words of the song. They are actually out of sync by a few seconds because in the first Lion King movie the chorus was already sung at this point. See more...
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Continuity: 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.