Honestly the talk is not worth watching in its entirety (unless you want to see the man himself in his "fullness").
Here are decent pieces:
• On actual clipboards
• "A quotation is an example of a transclusion"
• "Vannevar Bush's As We May Think - everyone takes that as the origin of links, it's not, it's the origin of transclusion! Each of Bush's trails was the same content put on the trail."
• "Do the best you can for the content itself" -