The crash picture's weird with that person down by their feet. I didn't notice him straight away (small pic on my smartphone). Strange angle. Perhaps it's just someone lying down looking under the car. Perhaps it is Rolf Wütherich as the report says he was thrown from the car onto the shoulder of the road but it still looks weird.

If it is him, they don't seem to be giving him much help! When you look at the vehicle, you wouldn't think anyone could have survived. Dean's injuries were so bad his casket was kept closed at his funeral.
P.S.
Just read that someone thought it was James Dean but as he had a broken neck I can't see how it could be.