Although parts of the story are fictionalized, e.g., the fight in Montana and the Shelly character (Michael McClanathan), the parts of the story surrounding the dinner and the draft board are indeed true. In fact, the dumping incident was even reported in the North Adams (Mass.) Transcript, Dec. 1, 1965, p. 15:
Boys Ordered to Remove Litter
LEE -- Because they couldn't find a dump open in Great Barrington,
two youths threw a load of refuse down a Stockbridge hillside on Thanksgiving Day.
Saturday, Richard J. Robbins, 19, of Poughkeepsie, N.Y., and Arlo Guthrie, 18,
of Howard Beach, N.Y., each paid a fine of $25 in Lee District Court after pleading
guilty to illegally disposing of rubbish. Special Justice James E. Hannon ordered
the youths to remove all the rubbish. They did so Saturday afternoon, following a
Police Chief William J. Obanhein of Stockbridge said later the youths found dragging
the junk up the hillside much harder than throwing it down. He said he hoped their
case would be an example to others who are careless about disposal of rubbish.
The junk included a divan, plus enough bottles, garbage, papers and boxes to fill
their Volkswagen truck. "The stuff would take up most of a good-sized pickup truck,"
Chief Obanhein said.
Incidentally, the blind judge is played by the real blind Judge James Hannon