I actually saw the National Geographic TV special about this when I was in China. Didn't want to swipe Trevor's fun though. But I see he hasn't been revisiting the thread to "take it from there" like he said he would.
I've VERY familiar with Marin County and the GG bridge. I lived in Marin for 34 years, and there is no question what that shot is. It is from in the Bay looking Westward with the Marin Headlands on the right (North).
I think everybody should have at least one Urban Legends" URL on speed-dial.