I never heard anything online about this, but I spotted the Man in the Moon in Rise of the Guardians. Out of all the times I've seen it, it was only when I was across the room without my glasses that I saw it. Maybe I'm looking too much into it... Let me know.
And since I'm on a little rant... Don't these two girls look EXACTLY the same, and don't they both look like Adult versions of Jack's sister?
And with that said, I'm off!