Principal photography began November 27, 1972, and finished in late February 1973. Coppola has cited Michelangelo Antonioni's Blowup (1966) as a key influence on his conceptualization of the film's themes, such as surveillance versus participation, and perception versus reality. "Francis had seen [it] a year or two before, and had the idea to fuse the concept of Blowup with the world of audio surveillance."[4]
On the DVD commentary, Coppola says he was shocked to learn that the film used the same surveillance and wire-tapping equipment that members of the Nixon Administration used to spy on political opponents prior to the Watergate scandal. Coppola has said this reason is why the film gained part of the recognition it has received, but it is entirely coincidental. Not only was the script for The Conversation completed in the mid-1960s (before the Nixon Administration came to power), but the spying equipment used in the film was discovered through research and the use of technical advisers, and not, as many believed, by revelatory newspaper stories about the Watergate break-in. Coppola also noted that filming of The Conversation had been completed several months before the most revelatory Watergate stories broke in the press. Because the film was released to theaters just a few months before Richard Nixon resigned as president, Coppola felt that audiences interpreted the film to be a reaction to both the Watergate scandal and its fall-out.
The original cinematographer of The Conversation was Haskell Wexler. Severe creative and personal differences with Coppola led to Wexler's firing shortly after production began, and Coppola replaced him with Bill Butler. Wexler's footage on The Conversation was completely reshot except for the technically complex surveillance scene in Union Square.[5] This movie was the first of two Oscar-nominated films where Wexler would be fired and replaced by Butler, the second being One Flew Over the Cuckoo's Nest (1975), where Wexler had similar problems with Miloš Forman.[6]
Walter Murch served as the supervising editor and sound designer. Murch had more or less a free hand during the editing process because Coppola was working on The Godfather Part II at the time.[7] Coppola noted in the DVD commentary that Hackman had a very difficult time adapting to the Harry Caul character because he was so much unlike himself. Coppola says that Hackman was at the time an outgoing and approachable person who preferred casual clothes, whereas Caul was meant to be a socially awkward loner who wore a rain coat and out-of-style glasses. Coppola said that Hackman's efforts to tap into the character made the actor moody and irritable on set, but otherwise Coppola got along well with his leading man. Coppola also notes on the commentary that Hackman considers this one of his favorite performances.
The Conversation features a piano score composed and performed by David Shire. The score was created before the film was shot.[8] On some cues, Shire used musique concrète techniques, taking the taped sounds of the piano and distorting them in different ways to create alternative tonalities to round out the score. The score was released on CD by Intrada Records in 2001.[9]
Inspiration
The character of Harry Caul was inspired by surveillance technology expert Martin Kaiser, who also served as a technical consultant on the film.[10][11] According to Kaiser, the final scene of the film—in which Caul is convinced he is being eavesdropped in his apartment, cannot find the listening device, and consoles himself by playing his saxophone—was inspired by the passive covert listening devices created by Léon Theremin, such as the Great Seal bug. "He couldn't find out where [the bug] was because it was the instrument itself."[12]
Coppola also based Caul on the protagonist of Herman Hesse's 1927 novel Steppenwolf, Harry Haller, a "total cipher" who lives alone in a boarding house. Coppola also made Caul religious, originally intending the character to have a confession scene; Coppola has said that the practice of confession is "one of the earliest forms of the invasion of privacy—earliest forms of surveillance."[13]
