One thing thing he mentioned that caught my attention was that the involuntary head bobbing, eye rolling was a common dyskinesia event caused by prolonged use of the dopamine replacement drug.
Which leads to the question of how many dem politicians knew of the Parkinson's and did it affect their surprising switch to the unknown and inexperience junior senator from Illinois. Keep in mind that the Clinton hold on the party was so great that when she announced her run for the US Senate in NY in 2000, Nita Lowey, a long time hard working pol immediately dropped out. Eight years later many of the staunch Clinton supporters unexpectedly switched to Obama.
That's not to say that they knew or even suspected Parkinson's was the problem, but seasoned successful politicians would sense the random oddities in behavior indicated something wrong with Hillary. Interesting points which some later historian might stitch together for a better portrait.