If you think that's bad, notice how many of them don't have a rear view mirror...
Whenever a scene is shot such that the camera is looking into the car from over the hood, so that you can see the faces of the driver and passenger, it's common for the rear view mirror to be removed so that it doesn't clutter up the shot.
LOL -- I swear, just as I was typing this, there was a commercial on TV (the one where the guy is letting his dog drive his truck), and sure enough, the rear view mirror was absent.