actually after watching it, all those concepts he talked about are pretty correct from my experience....although I totally agree that his methods of accomplishing those concepts are very rough around the edge, but still its in the right direction...and for the cub scout level for parents and their kids who have never built a car before, it would help even now considering what I see at our own races...of course they could just join our forums and get it right out of the top racers at the NPWDRL!
I don't know if I agree with the groove axels not adding speed though....I know the physics and that equation and why mathematically it shouldn't have an effect but having run both, on the track in a real race, I do think grooves are faster for whatever reason, physics or other....
The graph showing wheel speed as represented by how long a wheel spins however we all know isn't the best measure...and doesn't reflect the true advantage of oil over graphite....but he never talked about oil so.
All in all it was actually fun to watch and I think was fine..again, just rough around the edges so to speak....and I did actually like the way he used the blocks to explain energy and friction! Having lectured to kids ranging from second grade to middle school on these cars, believe me....ANY visual cues you can give them to help grasp a concept is 10 times better than just words....
of course all of this is just my opinion at least....LOL