But still, this wasn't a 'prepared' speech.
Watch him shuffle through those 3 X 5 cards. Each on contained the notes to each of the vignettes he covered. In fact, the speech is a series of speeches, or diatribes, each long practiced on a range of topics.
That is why it is so disjointed. As an example of what I'm telling you, watch his transition from a discussion of Social Security to foreign policy; he did it almost without a break and certainly not a segue.
LOL, the medium is the message.