Dirty Harry "Rawhide", was responsible for creating Callahan's distinctive old-fashioned brown and yellow checked jacket to emphasize his strong values in pursuing crime. Filming for "Dirty Harry" began in April 1971 and involved some risky stunts, with much footage shot at night and filming the city of San Francisco aerially, a technique for which the film series is renowned. Eastwood performed the stunt in which he jumps onto the roof of the hijacked school bus from a bridge, without a stunt double. His face is clearly visible throughout the shot. Eastwood also directed the suicide-jumper scene. The line, "My, that's a big
Dirty Harry (character) wife that his wife was killed by a drunk driver. She appears in "Magnum Force" in an old photograph which Harry turns around. The doctor tending to him after the first film's bank robbery intimates that "us Potrero Hill boys gotta stick together". The first film's novelization explains that Callahan grew up in this neighborhood and describes a hostile relationship between the police and the residents. Callahan recalls once throwing a brick at a police officer, who picked it up and threw it back. The following sequels show that Harry lives within the city limits in a small studio apartment