Chief Justice Garrison?
/10 with 45 votes
In the film when Chief Justice Warren says that Oswald acted only and nobody else was in on the Kennedy killing, he is played by the real Jim Garrison whom the film is about. Garrison mentioned that Warren must have rolled over in his grave.
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Red Raincoat Lady
/10 with 15 votes
In the Director's Cut of this movie, during the questioning of Jean Dixon (Red Raincoat Lady from the Zapruder film), the real Jean Dixon cameos as the FBI stenographer.
/10 with 13 votes
In the scenes involving Donald Sutherland and the three tramps the man who sends Sutheralnd to the north pole and gives a signal to the three tramps(who I believe is supposed to be Ed Lansdale) is played by Oliver Stone's Military Consultant Dale Dye.