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Wayne Tippit appeared in this production as an FBI agent. Similarly named J. D. Tippit was an American police officer in Dallas who was killed by Lee Harvey Oswald about 45 minutes after the assassination of JFK on 23 Nov 1963. Tippit was shot dead in the Oak Cliff section of Dallas, Texas. Lee Harvey Oswald was initially arrested for this crime prior to being charged with killing President Kennedy. Oswald was charged with both crimes shortly after his arrest but was killed by Jack Ruby two days later.
The murder of Oswald by Jack Ruby was filmed on location in the actual basement garage of Dallas City Hall, where the real-life shooting took place.
Oliver Stone showed this film in December of 1991 to all of Congress on Capitol Hill. It led to the 1992 Assassinations Disclosure Act. This Act allowed the American public to see important documents regarding JFK's assassination in the period of 25 years (the original year for such disclosure was 2029). On 26 October 2017, the Trump Administration released a great part of the documents known as the "JFK Files".
John Candy's (Dean Andrews') sweaty face during his talk with Garrison is real. Candy was petrified at the idea of appearing in a dramatic film with actors like Gary Oldman and Donald Sutherland. He sweated profusely throughout all his scenes.
Oswald's arrest was filmed in the real Texas Theatre where it happened. Money from the producers helped to restore the theater and keep it in business.
Donald Sutherland and Kevin Costner both have very long monologues in the movie. According to Oliver Stone, both of them memorized these speeches. Kevin Costner had thought that one take was necessary for his speech.
Oliver Stone: Seen very briefly in the assassination re-enactment. Look very close for him as the Secret Service agent who runs towards the back of the limo after the fatal headshot.