I was walking through the Civic Center last weekend and happened to catch the filming of a new motion picture called "Milk," which tells the story of a murdered city councilman in the 1970s. Sean Penn is playing the title character, and he was there at the filming as well. For the scene, they were recreating a famous rally that occurred at San Francisco's City Hall.
Here is a 1970s-era bus:
And here is Sean Penn in the middle of filming a scene:
An City Hall all draped out (complete with 1970s cars) during the filming: