For the squeaky styrofoam noise, I've experienced this on the IS and RX. It's the rubber door seal rubbing against the metal frame of the door while driving as I suspect there's a very slight movement of the door.
Not an elegant solution, but I added fabric tape (i.e. hockey tape) along the door frame and that particular squeak is gone. My car is tight so far, knock on wood - nearing 10k km.
Last edited by corradoMR2; 06-20-14 at 08:03 PM.