- The producers hired a private investigator to track down the real-life Zodiac survivor, Mike Mageau.
- Dave Toschi in real life was the inspiration for Steve McQueen's performance in Bullitt. In the film, Graysmith mentions that Toschi wears his gun like Bullitt. Avery replies that Bullitt got it from Toschi.
- The cab scene on Washington and Cherry Streets in San Francisco could not be entirely shot in San Francisco due to filming restrictions and the opposition of the neighborhood residents. So, a set of the intersection, including the street, apartments and crime scene was constructed at Downey Studios just outside of Los Angeles, California. Backdrops of San Francisco were digitally inserted to complete the scene. Only a few seconds of actual footage shot in the original crime scene location remains in the scene.
- Movie Goof (factual errors): The interior of the PSA flight boarded by the detectives and Paul Avery reveals 5-across coach seating, standard fare for a DC-9, a popular airplane in the 1960s-1970s. The lady seated behind David, however, is holding a safety card reading "727-200," an airplane which seats 6-across in coach.
View All: Trivia - Goofs - Quotes
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