Before I wax lyrical, when I watched this 'in store' in the states, it was missing a scene (maybe more).
When Happy Feet starts dancing again in the aquarium, the scene jumps straight from that to him arriving back at the collony. Gone is the part where we see his video pasted over youtube, the news in a few countries, and the whole 'oomph' of the ecological message.
I loved this film at the cinema, it manage to convey a message in a non-schmultzy way, and was hilarious in the bargain.
Williams is on fire with this one, and the premise works so well, that missing scene bugs me though, because it was so integral to the story.
Again, I plea apon anyone who's bought the DVD from play.com to write a review stating that it is in.
Hopefully this is a US only thing.