That's the thing with him, he spends more time "on air" trying to be funny and talking philosophy than explaining the very small things he does that matter.
I didnt' wathc the whole thing, only the first 10 minutes. He does things, like uses the whip behind himself to move the horse forward. Now, a lot of folks might not know about that, so I would think him explaining that as he worked would be very helpful.
And, sometimes while he is talking , the horse get's more into his space than I think a trainer would allow if they were not focussing their attention on speaking to and entertaining a crowd.