The opening scene where the vets in the hospital are talking was totally unscripted. They were real Vietnam vets discussing their own views about the war. Jon Voight was supposed to have added to the dialog, but out of respect stayed silent and listened.
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One of the first films even partially dealing openly with the idea of sex between an able-bodied person and a disabled one. Other films dealing with disability and romance had indirectly implied it or avoided it altogether (such as in Les plus belles années de notre vie (1946)).
Jane Fonda had wanted John Schlesinger to direct, but he declined as he felt that the Vietnam experience should be filmed by an American director.
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Jon Voight's role of Luke Martin was loosely inspired by paralyzed Vietnam veteran Ron Kovic, who was making inroads in Hollywood with his book "Born on the Fourth of July" at the time. Of course, Kovic's book and story was in 1989 put on the screen with Tom Cruise in the role of Kovic.
Jane Fonda wanted Meryl Streep for the role of Vi but Streep had already signed up to appear in a play.
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This film was one of two 1978 movies that actress Jane Fonda starred in in 1978 that had similar titles. The pictures were Le retour (1978) and Le souffle de la tempête (1978).
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Cameo
Haskell Wexler: the DP appears as the general during Captain Hyde's medal ceremony.
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Director Cameo
Hal Ashby: a passenger in a convertible sports car passing the one Jane Fonda is driving. He flashes the peace sign at her just as he passes.
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Spoilers
The trivia item below may give away important plot points.