Atlantis (Donovan) Easter Egg - Atlantis - Featuring the Beatles?

If I recall correctly, the backup group on Atlantis is actually The Jeff Beck Group (minus Rod Stewart), who did a few collaborations with Donovan at that time; they may even have been credited on the sleeve and/or label.

This song came out after "Hey Jude", which may very well have influenced the singalong aspect to the end of the song. Paul Macartney (SPELLING?) sang on this song for sure, as for the rest of the Beatles, I am not so sure.

I thought The Jeff Beck group only appeared on Goo Goo Barabajagal?

Well, if you own the LP or EP, you'll know that the Jeff Beck Group played on Barabajagal and Trudi. They did NOT play on Atlantis, let alone any other track on the album other than those previously mentioned. As for the Paul Mcartney thing, it's possible, I've heard that it's true, but you can't really know, unless you ask Donovan. Many people thought that Mellow Yellow (electrical banana) was instructing you to smoke banana peels, and in all actuality it was all a misconception thought up by a drug-crazed nation (any Don 'historian' knows that he gave up all drugs after 1967 when he met the Maharishi Mahesh Yogi w/ the Beatles and Mia Farrow). It's much more likely that Paul sang on the track rather than all of the Beatles. I say this because Paul and Don worked together on a couple of things (the Abbey Road bootleg is proof of this, along with Don's line for Yellow Submarine...he wrote it for Paul...something about the sky is blue and the sea is green in my yellow submarine? something like that).

Actually -- and speaking of Mellow Yellow -- I've heard that it's Paul McCartney saying "quite rightly" on Mellow Yellow... but I don't know if it's true.

According to a reference book I have that chronicles every time a Beatle farted, Paul played bass and was in the Atlantean chorus; no other Fab was present.

Paul does appear on "Atlantis." He is playing the tambourine.