I love that Monterey recording (the first link you posted). I was watching that with my daughter last year and pointed out all the other stars of the time who are featured in the video just walking or sitting around. It really cracked me up to see that Byrd with the big Russian fur hat. Those hats were the Byrds’ gimmick at the time. Mama Cass looked like she was having fun, too.
Respectfully, the guy in the video in the "big Russian fur hat" is John Phillips of the Mamas and the Papas, husband of "Mama" Michelle Phillips.
That fur hat was Phillips' trademark hat if you watch any old clips of the Mamas and the Papas.
Phillips also wrote the song, which would explain why he's playing it on stage for McKenzie to sing.
