The last trick is pretty obvious, put a camera on the hood, and tell him he's being recorded, but it's feeding a screen under your hood.
Well, they already show cameras all over the car (for the purpose of taping the segment). But the salient point is that blindfolded Keith Barry is not the one who's driving. There's some guy in the trunk who has actual control of the car.
What I think is interesting is, if you actually thought that he was driving blindfolded, you wouldn't let him continue. You'd grab the steering wheel and run him off the road, rather than let him recklessly drive through 5 people. By letting him continue, you're unconsciously admitting that you know he's faking it. (cf: Sawing a Lady in Half trick.)