This was an issue I raised here back in 2012 courtesy a small clipping in the Smile Sessions box set (CD gatefold, far left panel FYI) that mentioned a meeting at Derek Taylor's house between Paul, George, Carl, and Brian.
That discussion tracked it down to the Beatles visit to LA during their last tour in 1966.
Paul's recollection of hearing GV adds MORE info to this. It was most likely an early version of GV, either an acetate or a tape dub of what had to be the state the song was in at that time, whatever that may have been. But wow...there is some new info courtesy of Paul! Thanks Paul!
Here's the original thread from 2012 which shed more light on that meeting at Derek Taylor's:
http://smileysmile.net/board/index.php/topic,12096.0.htmlPS - Paul's comments as of this most recent interview again sheds light on how the Beach Boys, Brian, and Pet Sounds in particular were influences on what Paul and The Beatles were doing in the mid 60's.