Been wondering the same. Happy to believe it could have been genuine apart from the shots from the 'cliff edge' bonnet position. Clearly taken from the camera car, and no clear shot of the two vehicles and the road in close up - only from a distance. I think a bit of artistic licence. I also felt the same about RH 'accidently' letting his Toyota roll off down the final descent - suspected it might not have had the brakes for it so they 'let it go'. It seemed to be more about the presenters than the cars, and for me that is the wrong way around.
I have been a big TG fan for ages, but really think this last series is getting a bit 'old hat' and formulaic. Almost as if they have done 'crazy stunts' to death and now are reinventing the wheel (excuse the pun). Either that or we are more used to it. It needs to define exactly what it wants to be, at the moment I think it is floundering a bit. Bring back the races with JC against RH and JM, drop pointless silly bits like 'building a zany car' (yeah, like the three of them and them only built it) and do something interesting. The proper 24 hour race was good, decent reviews of top end cars are good (I dont have to be able to afford it to enjoy a decent review of it) take an off-roader and off road in it, but concentrate on the car, not how sweaty JM is or how silly JC is to think a pair of denim Jeans is ideal wear for the Amazon Jungle.
Then again I could just be being a grumpy old git!
Steve