When going over small bumps such as driving on a bumpy road, I noticed the driver's seatbelt (where the metal clip connects to the release) would make a clickity click noise.

Put some tape inside the square on the metal part of the seatbelt. This insulates the metal part from the metal inside the release mechanism. No more clicky click rattle on bumpy roads!

If you've noticed it give it a try

 

Nope, zero rattles here - even in extreme cold temps so far....

 

no rattles here...only seat belt rattle I get is if someone gets out of the passenger side seat and the piece thats suppose to clip in his banging against the beam of the car which is easily cured by fumbling with it so it doesn't touch it

 

"Rattle" was the wrong word to use... Clickity click is more accurate!

No rattles here, either. Very tight vehicle IMO.