During one part in the big truck heist near the end of the movie, Vince is being flung all around the truck. At one point, Vince is seen grabbing w/ his right arm for the sunroof on Dom's Honda. He is then flung back and hit's the door on the truck. In the very next shot, Vince's right arm is all wrapped in the steel wire and is bleeding severely.
IIRC Vince holds the cable the whole time with his right hand. He's facing the hood of the truck, and has the cable in his right hand all through this scene (I've seen the movie twice, so I'm quite sure about it).
He gets thrown off the hood by the trucker braking when Vince reaches out to get into Dom's car. Right after that the trucker goes to the left, causing Vince to flip over, and hitting the door. His right arm gets trapped in the cable at that point.
This slipup is right after they drive past the train in the end of the movie. Dom is seen driving his dad's hotrod and a truck pulls in front of him. His car flips about 5 times but on the first flip(it is in slow motion)you can see clearly the stunt drivers helmet. Dom wasn't wearing a helmet when they raced, so they should have airbrushed this out. It is SO obvious when you see it.