One of the things that struck me was Mike Love in turban (the second photo shows him with Al Jardine.)
Mike had gone to Rishikesh, India, as part of a group of sixty, organized by The Beatles and including also Donovan and Paul Horn, in February. There they studied Transcendental Meditation with Maharishi Mahesh Yogi. I guess this is evidence that Mike was still fully in to TM in the mid-seventies.
While they were all there, The Beatles wrote and recorded a lot of music, that would show up on the White Album and Abbey Road.
And they recorded this, which never appeared on record: the very very BeachBoysesque "Spiritual Regeneration/Happy Birthday Mike Love," on the occasion of Mike's birthday.
I guess the most Beach Boys-sounding Beatles song ever recorded is "Back in the USSR," penned by Paul McCartney. Mike Love has stated that he encouraged McCartney to "talk about the girls all around Russia, the Ukraine and Georgia" to make the song sound more Beach Boys.