I noticed that a few years ago, when the deluxe edition came out. I know The Who supposedly was fed LSD-laced drinks backstage and were “flat-out tripping against their will” for their set. It wouldn’t surprise me if Pete indeed soiled himself that morning.
IMHO 1970 Isle of Wight was a much better performance than Woodstock. That version of “Young Man Blues” is much better than even the Live at Leeds version.