It was good, fun film, but like many others, the ending sucked.
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I mean, seriously? Ending the film with a caterpillar/butterfly? He had 5 speaking lines! At least end it with an important character, like the Hatter or the Red Queen or something.
You know what would have been cool? Revealing that the real-world Alice was actually Cheshire and cutting back to Wonderland where we're shown that Alice actually stayed.