With mine the plastic surround on the passengers air vent was squeaking and rattling, fixed that with just wedging a piece of rubber in one of the edges..inside the door card the door catch release arm wire was rattling about loose, again i just wedged a thick rubber washer behind it, with a bit of grease on it so as not too tight and can still slip back and forth easilly. The other thing which i think is common is the seat belt feed from the door pillar..well mine was rattling around there somewhere anyways..i've got a piece of polystyrene in there just holding it all steady but not fouling the seat belt action,
Hope that helps...