I just watched "Crystal Fairy and the Magical Cactus" yesterday, and I thought it was really quite good. I feel like the characters gained a lot of insight from their San Pedro experience which, for the two main characters, catalyzed emotional breakthroughs which were really central to the plot of the film. Supposedly Michael Cera and Gaby Hoffman (playing the main characters) actually drank San Pedro tea while filming the movie, allowing the film to depict the cactus experience in a more genuine manner. The cactus which they acquire, and subsequently prepare in the movie certainly looks genuine so I wouldn't be surprised if that was the one they ingested. (Not to mention the fact that it is a very large and beautiful specimen! :want: )
I highly recommend this film for the cactus lovers on the forum, or really for anyone who is interested in watching a very unique, drug-themed, somewhat comedic drama.