 Scenes of Dave Toschi and Robert Graysmith watching "Dirty Harry"  were filmed inside the Mann National Theatre in Westwood, CA. The  garish color schemes of the movie theater were not added by the art  department. The very retro interiors of the theater have remained  unchanged since 1969, when the National was first built.  Interestingly, "Zodiac" played at the Mann National Theatre in mid  March of 2007. Thus, moviegoers watched other moviegoers occupy  their seats 