As far as what I thought of the show, it was pretty good. They certainly showed some good logic on what they called "the lost bullet". It's too bad that the traffic light in question can't ever be examined.
As far as NatGeo not getting it right all the time... I don't expect them to. Regardless of who the principals or principles of any corporation may be, it's television and television is always written, produced and directed for entertainment. If people don't find it entertaining, it's a flop. I found this video entertaining as well as informative and the 'high resolution' of the old 'home movies' sure do make the whole horrible incident clearer.
At 33 mins. I thought it got really interesting with a new explanation for the third bullet.
I also watched another one about the audio recordings from that time but I'll be darned if I can find it. There was one comment made during an interview regarding Jack Ruby and LHO's shooting and some guy (who claimed he knew Ruby) says something to the effect that he suspects Ruby did it to silence LHO. These sort of comments are what CTs are made of. I wonder if anyone has ever found the guy to ask him exactly what he meant. I'll be darned if I can find the video either.