Banjoist,
I believe that the TV show appearance was impromtu enough that he was playing a borrowed guitar.

Put me at the head of a very short list who thinks his nylon string playing is nylunacy. I never liked the gimmick, even though I really like the nylon string for pop -- from "Green Grass"-Gary Lewis and the Playboys, to Michael Johnson, to Guy Van Duser. I even like the sound of fingerpicks on my classical, but...
...flatpicking leads sound wanky.