When the car is turned off (also happens if you cycle ignition to the Acc position and back again), if you wait a few moments you will hear what sounds like a marble dropping into a plastic cup. Happens twice. The second drop is tied to the headlamps and interior lamps going off, which leads me to believe the apparatus making the sound is some kind of timer for those systems.
A whistle sound after you lift off the throttle is the compressor bypass valve venting.
Seatbelt buckle vibrating against interior plastic next to it.
Seat leather rubbing against door (I haven't noticed driver side, but passenger side seat may touch the door slightly when no occupant is in the seat).
Chrome accents over the speedo and tach can come loose and rattle. Push 'em back on.
Brakes can feel smushy or grindy when ABS or OHB kicks in. Manual says they may make noise...but I've never heard it. I have had ABS kick in
You may also hear mechanical noise when ESC kicks in. I've never heard the mechanical sound, but I have had ESC kick in.
Tires may squeal on low speed turns on concrete or parking garage surfaces.
Rocks and gravel can kick up into the rear wheel well, creating ping ping ping sound off your left ear.