Got my car back from the dealer last week, and the fixed all the rattling! Here's a summary of the different fixes over time
Rear View Mirror - Dealer replaced mirror, rattling went away
Plastic Headliner - After a few attempts, dealer found it was the bracket holding the LED in the Airbag Warning indicator, and put some felt in. Now its totally silent
Doors - Dealer adjusted both door latches to match the position of the door. Though these can be adjusted they are always put in the same position at the factory. The doors are totally silent now!
Vanity Mirror - Informed that this was common. I guessed as much, and I don't expect a fix except I might put a piece of white felt above it or soemthing
Breaks - Shop Foreman drove along with me, heard the sound, and said he'd check to see if there was uneven wear or a sticking pad. After inspection, he said everything is normal and OK, though sometimes i'll still hear a sound. Not sure about that, but that's material for another thread.
I'm really happy with San Francisco Smart's service. They really tried to sort the rattles out and succeeded! All in all I had my smart in 5 times to analyze the noises (mixed with other things like the 10,000 mile service). With my previous car (a VW) my concerns would have been blown off a long time ago (they blew off a nasty sqeal from my engine and the fact that my turbo kept cutting out even though I was willing to pay for a repair after my warrenty had expired). Smart SF really followed through on something as minor as interior rattle, and came through with the results. I'm very happy to be a Smart owner now, and confident that my car is well taken care of. Thankyou Smart SF and Felipe!