It is Derek Taylor that stated in a book he did in the seventies that the Pet Sounds promo film was done in the mountainous region above Lake Arrowhead. That's where the idea that Brian's spiritual trip could have happened came from.
I laid it all out on my webpage;
http://pages.cthome.net/tobelman/The_Out-Of-Sight_SMiLE_Site.htmlIf you compare David Anderle's description of Brian's "Big Sur" adventure to Lake Arrowhead you'll see that Anderle's description could apply to Lake Arrowhead as well. Anderle mentions that Brian got into the "snow" and I've often wondered if Big Sur had any snow in late April of '66. There's a good chance that Lake Arrowhead had snow.