Monkees film -- in which I teased out some of its parallels to Roger Corman's THE TRIP, also scripted by Jack Nicholson -- can be found in VIDEO WATCHDOG #163. Watching it again, I realized that the Maharishi played by Abraham Sofaer is supposed to be Marshall (Maharashall?) McLuhan.
Viewed on Criterion Blu-ray, which has a spectacularly crisp image and one of the best 5.1 remixes I've ever heard. Now it's the only way I'll watch it.