I pulled about 6 or 7 littel "U" shaped plastic clips from inside the door panel. Every timeI shut the door it sounded like a couple of bear cans inside banging around.
I got all of these out by removing the door panel light at bottom. There must still be one in there though because I still hear it. I've got that item, and the cheap-ass trunk light that needs to be replaced because you have to pull on it to get it to come on. Very minor things, and I've owned the car about 15 months, but will be sure to get them fixed while it's under warranty.