A) Lennon discovered and got very deep into LSD in 1966, mere months before Lucy in the Sky was written. He had a powerful ego death experience [1].
B) Admitting to the public that one of their hit songs was about a controversial drug was an obvious PR no-no.
I guess there's no way to know for certain either way, though.
[1] "When McCartney and Lennon visited the newly opened Indica bookshop, Lennon had been looking for a copy of The Portable Nietzsche but found a copy of The Psychedelic Experience by Timothy Leary, Richard Alpert, and Ralph Metzner, adapted from the translation of the Tibetan Book of the Dead by Walter Evans-Wentz, which was introduced to Leary by Aldous Huxley. Lennon bought the book, went home and followed the instructions exactly as stated in the book. It discussed an “ego death” experienced under the influence of LSD and other psychedelic drugs, supposedly essentially similar to the dying process, and requiring similar guidance."
https://www.theatlantic.com/technology/archive/2013/01/the-l...
https://youtu.be/dSIKBliboIo?t=25
(There's another YouTube video, which isn't turning up presently in search, that explores this concept far more deeply, including noting the IBM logos on certain equipment still visible, including Bowman's newspad, a pre-imagining of today's iPad and Android tablets.)
Hrm: it's been removed. Though there's a mention of it (and an IBM logo on one of the Discovery space suits) here:
http://www.slate.com/blogs/browbeat/2013/01/07/hal_9000_ibm_...
The (former) video:
https://www.youtube.com/watch?v=K1r5dOwUS6Y
Rob Ager's channel:
https://www.youtube.com/user/robag555/videos
Much of the analysis (and more film stills) here:
http://www.collativelearning.com/2001%20chapter%208.html
Trigger warning: TV Tropes:
http://tvtropes.org/pmwiki/pmwiki.php/Main/ImplausibleDeniab...
There are lots of coincidences like that, for example, Windows NT (WNT) being a one letter shift of VMS. I'm inclined to believe what people say they meant and put everything else in the conspiracy theory bin of plausible truth.
https://projectunspeakable.com/conspiracy-theory-invention-o...
Though that theory has ... its own critics:
https://www.csicop.org/specialarticles/show/nope_it_was_alwa...
Usage of the phrase began rising sharply in the 1950s:
https://books.google.com/ngrams/graph?content=conspiracy+the...
As for the VMS -> WNT shift, I'd considered mentioning it above.
I'm something of a fan of the multiple-explanations model. There are connections which may have multiple explanations. The IBM->HAL ties are too obviously deliberate in the film to be simple coincidence -- one does not project the letters "IBM" by accident, and certainly not in such a pivotal scene. I've also been part of far too many group / organisational discussions in which claims at deniability were made, clearly without substance.
As for the ability for some within a project to be working toward goals unknown to others, even at large scale, I'm reminded of the Glomar Explorer mission in which a large, secondary, scientific mission was presented as cover and for which many members of that cover mission didn't learn the truth of the primary objective until the story broke in newspapers.
I saw that refuted in a documentary quite recently...
Backed up by Snopes too : https://www.snopes.com/fact-check/lucy-in-the-sky-with-diamo...
only recently was discovered even