This film features Laurence Fishburne and Scott Glenn. Both actors have played the role of FBI Agent Jack Crawford. Glenn played the role in the theatrical film "Silence Of The Lambs" while Fishburne played the role on the TV series "Hannibal".
Marlon Brando improvised the line "You're an errand boy, sent by grocery clerks, to collect a bill."
Military sets for the movie were nearly destroyed by a hurricane during filming. Instead of breaking them down and starting over, the partially-destroyed sets were used to create new scenes in the movie (including the scene in "Redux" where the playmates are stranded at the deserted military base).
The first film to use the 70mm Dolby Stereo surround sound system.
The water buffalo (carabao in Filipino) that was slaughtered was real.
Was Filmed in 1976 but not released until 1979.
Steve McQueen was the first to turn down the role of Captain Willard which was accepted later by Martin Sheen.
Martin Sheen had a heart attack during the filming and some shots of Willard's back are of doubles, including Sheen's brother Joe Estevez who was flown out specially. Coppola was so worried that backing would be withdrawn by the studio and distributor if news of Sheen's heart attack leaked out, that he kept it quiet, even to the extent of explaining Sheen's hospitalization as being due to "heat exhaustion" in the official Shoot Schedule.