I'm dunno if you already knew this but I just figured it out.

[Ouch!]

Unmarked spoilers.

Including Kingdom Hearts II and Deep Dive, Mickey has appeared in three scenes. The first, where it just shows his silhouette and he barely moves at the end of KH. His flipping down onto the top of the building in Deep Dive. While he moves, it's more of a blur, and once he lands he stops moving. His ears are hidden under the hood anyways. And in the trailer of KHII it shows Mickey flipping down, beating the crap out of those white heartless thingies like Yoda in Ep. II, once again, in a blur, and then he lands and basically stops moving. His ears are also under his cloak for this as well.

So far, I think they've done a good job avoiding it. However, I think they'll be able to break this habit if they want to make him important in KHII.

[Dark Songstress]

Hm? What,s Wrong?

well, what with ears looking different in KH? Mickey was barely in the game

[Doomgaze]

I just worked out that they'll never make a doll of Mickey Mouse, because his ears wouldn't be able to always face you.

[Advent Child]

Well they could show him in (SPOILER)the unknown coat, with the hood up.

[Megumi]

You know, that's probably one of the scariest things I've heard...
I feel like my life is crumbling! Well not, but it's still very interesting cause it makes completely sense. Hmm...

[Doomgaze]

I was flipping through the channels today and that house of mouse thing was on - and yes, when he rotates his head, the ears don't move. It's a little weird to actually watch, but I had never noticed it before.

[Pheesh]

I just worked out that they'll never make a doll of Mickey Mouse, because his ears wouldn't be able to always face you.

what do you mean by doll? because there are heaps of toys that you can get of him.
here's one.

[Jolts]

They could easily make it so that the ears always face the "camera" in video games. It's just a matter of proper manipulation.
However, if the game showed a "bird's eye" view of Micky, and his ears faced the camera, that would look ****ed up .