> Afghanistan :

John Milius and  Arnold Schwarzenegger commented those landscapes

as similar to Afghanistan ones , although the movie been filmed in Spain .

Afghanistan is surely the country where amongst others powerful Secret Societies got birth . 

> Psychedelia by Ron Cobb  

It's Ron Cobb , just the Conan the Barbarian 's Art Director , taking part in the movie 

as a drug dealer  . A remind as psychedelic symbol of the other world described

by Aldous Huxley in the essay "The Doors of Perception" . 

 > Peace , drug , flowers , the pilgrims :

A  little Woodstock in the antediluvian earth where people come in peace ,

use drug , fall in visions and are being prepared to Thulsa Doom's request ,

the last sacrifice .