Ben, I really feel your pain! Although I didn't buy brand new, I expected better.
I had a 2009 Falcon XR6 Turbo before this car - far, far, far, better with interior rattles and squeaks (it only had one on old roads with far more kms on it!). Years ago, a 2002 Monaro which was again, far better. It was an older design, big heavy doors, quiet cabin... Not annoying. My wife has had a 120i and now a 130i... Again, far better.
I've had 35-40 cars (I've lost count) and none have been as annoying interior-wise than this car. NONE. I can accept some rattles on some roads but not constant vibrations which drive me insane.
Today I've been driving around with the stereo on 40 but I can still hear them. WTF is the point of this I wonder some days, stereo has to go up and maybe put an exhaust on the car to drown out the rattles?
Lexus Canberra workmanship is very poor which is why I was hoping Chatswood might bet better?
This will likely be my first and last Toyota and if I can't get someone to sort it out it will no doubt make me trade the car... I don't want to make the people who said I should have bought an M3 right (esp since I'm from a BMW famiy!).