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Rewatching, I think his final cry of his "Grandma Moses" heckle is the key to LD's character: "I HATE FOLK MUSIC!" He wants out the whole week the film chronicles, but he has to leave bloody and battered (while the new boy king plays).
The making-of on the DVD is mostly about the music, but some interesting production design etc (they built the big green bathroom Goodman ODs in cuz they couldn't find anything satisfactory).