are you referring to when you're in cockpit being able to see some of the side of the body of the car? I guess I'm confused what you're referencing because you say reflection so it leads me to believe what I mentioned.
But, if you're talking about the shadows, they do cast shadows onto the car, as seen in screenshots above and before.
What throws me off is how you mention floating, which I could understand if they didn't cast shadows but, I dunno.
I would like to see parts of the body in my side mirrors, instead of just looking straight out... but as far as depth and looking connected, I believe the mirrors look fine, there is adequate shadows cast onto the other parts of the car in relation to the light sources.
EDIT* looking at a few more of the screens I do see some that don't have the shadows. -I think that'll be a wait and see when game ships because its not finished yet and that could be something their working on (which can be very likely). I will be a little disappointed if that detail is not addressed, but it won't affect my thoughts of the game, as graphics don't make or break a game for me. I don't fuss about it. It's a simulation racer, the fuss will come from the physics and feel of racing, and the competition and actual GAMEPLAY stuff.