Couple of things...
In iMessage, if you start swiping (try slowly) from the message view to go back to the list of conversations, but let go prematurely, the screen snaps back, but the keyboard keeps scrolling right for a second.
Also, in a conversation, I don't really care for the circle at the top with the persons initials on it because it makes the persons name very very small under it. It just looks poorly designed.
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Also, I just noticed with the keyboard while typing this. When you hit a comma (or anything that's not a letter) it doesn't go back to the regular letters again after you press the space bar. That's kind of annoying.