I agree with blur on parts seen through windows (and by reflections) but I cannot be that sure if the scenery in that spherical mirror would have so noticable blur as you expect Don.
/hunt for real photo evidence pics started
nah just kidding, anyways: since we can sucessfully expect the mirror being spherical, it will not only optically "squeeze" the landscape seen thru it, but obviously also any other effects from the camera lens - whether it be the DOF, or, for example, Lens Flares or highlights from the sun reflections.
Or in other words, mirror optics will effectively compensate the lens error, making the blurred parts more in focus again.
well... really widely appreciated error as I can see
i suppose the car`s rearview mirror works the same way as the mirror we have in bathroom - the picture on the mirror is "3d" and not "2d"..the attachment explains it
Or you could try going to Select > Color Range and choose Highlights instead of allocating a color, copying and pasting that to a new layer and applying a Gaussian blur to it. Choose the Screen blend mode and decrease opacity if needed. That's how I do it and I prefer it.
Reflections are really difficult with screenshots because you can't get the correct camera angle. Just look at DoN's bathroom pic, it explains it all.
And about the other pic - GC is right. I didnt even notice the car tbh, only after a deep look and after increasing my screen brightness.
But keep them coming, the last is already a lot better, only a weird reflection perspective, but it's a good start i'd say.
small hint:
just google around and look at objects reflecting on any surface, maybe it helps your imagination a bit... dunno just an idea