I supose everyone else has noticed Craig's twin brother driving the truck in the pre-title credits. Through the tunnels at the very beginning when Bond gets the DBS stuck alongside the lorry. The guy is wearing sunglasses, but has the same looks as Craig and the same hair, and when he fights against the wheel even pulls the same sort of expression. I can't be alone in noticing this, and the first time I saw it I was even confused for a moment. Why the hell did they pick someone so similar?
I watched this today...and I do see the resemblance, however, I think it's more coincidental than chosen. Although, having said that, perhaps someone else said the same thing on the day of filming, and put the truck driver in sunglasses to make it less so....
Now, I've watched this movie over a dozen times, and I have to say this is the first time (after your post) that I noticed.
It's amazing what other people pick up from this movie.... the subtleties are obvious to some, and yet obvious just goes over other's heads.... (a bit of a theme for me at the moment )
As for the colour. In the tunnel it seems grey, but in the light it seems black - and the police describe it as grey... but...I'm not convinced - it looked the same colour as the police car chasing it... and that was black
“So I kind of give it all I've got, and then collapse for a while!” ~ Daniel Craig
“The more I see, the less I know for sure.” ~ John Lennon