Also, forgot to add: sometimes I think my passenger door is rattling, but it's just the metal clip on the seat belt bouncing off the side of the car. Sometimes I hear another rattle and it's just the sun visor, or it's the dash itself. I've noticed the car rattles a lot more when it's cold, like this morning (in the single digits in RI). Also, because of the small stiff frame and short wheelbase, the entire contraption tends to rattle when you go over a bump (which, for a Smart, means anything bigger than a piece of gum, LOL).