Endings
Apparently there are two viewable endings on some DVDs. The original screenplay ending was never filmed.
In the original ending, a couple of Japanese soldiers arrive and tell Mifune's character that they want to dispatch the American right away. Mifune angrily opposes the idea, but some days later he sees the American's decapitated body lying in the compound. Enraged, Mifune grabs a sword and decapitates both of the soldiers.
Allegedly, Marvin suggested that the movie end with the two actors arguing and going their separate ways. Director Boorman liked it enough to film it and end the movie like that.
But the movie's producer, Henry G. Saperstein, allegedly did not like Marvin's ending. He thought it was not strong enough and felt that perhaps it was best the two perish when their compound gets bombed. The studio spliced in an explosion scene from the Peter Seller's film "The Party" (same year) and slapped it together for its original release.
Though now, with some DVDs, one can view both endings and pick which one they prefer.