Burgess Meredith appears as his Batman (1966) villain persona, the Penguin (although with a slightly different costume, and no trademark Penguin "beak" nose. This is a bit odd, as Batman and The Monkees were on rival networks, and aired at the same time slot.
The book Michael Nesmith is reading while talking to Oracullo is Max Heindel's "Simplified Scientific Astrology".
The song heard while Michael Nesmith and Frank Zappa play the car is "Mother People" by Frank's band The Mothers of Invention from the 1968 album "We're Only in it for the Money".
Michael Nesmith states in the 2002 DVD commentary that he didn't know until recently that the series' regular director James Frawley was the son of William Frawley (I Love Lucy (1951)'s Fred Mertz). According to Wikipedia, this statement is not true, Mike was just pulling someone's leg.
Musical numbers featured in this episode: 1. "Valerie" 2. "Daily Nightly".