The 1998 surveillance-corruption-thriller film Enemy of the State (which also stars Gene Hackman) has thematic connections to The Conversation. According to film critic Kim Newman, Enemy of the State could be construed as a "continuation of The Conversation."
Gene Hackman's paranoid, technologically brilliant character in Enemy of the State, who uses the pseudonym Brill, closely resembles Harry Caul in The Conversation. He dons the same translucent raincoat worn by Caul, and Brill's cage-like workshop is nearly identical to Caul's workshop in The Conversation. Enemy of the State also uses a still from The Conversation for Brill's National Security Agency file photo.
Enemy of the State also has other references to The Conversation, including a scene which is highly similar to the The Conversation's opening surveillance scene in San Francisco's Union Square.
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