1. Once the role played in the filming process is killed, the actors can go home immediately. When the filming was about to end, Sean was very sad in the helicopter scene;
2. The film was shot in the Philippines. The actors spent two weeks in the jungle living in a military camp;
3. At the request of Oliver Stone, some special Marlboro cigarettes-cherry red packaging were made specifically for the film. This is to get closer to the background of the era in the late 1960s;
4. The actors were warned not to drink water from the river to avoid malaria. During the filming process, Dalf felt thirsty, so he drank the river water, and later he found a carcass of a dead pig floating from upstream. He was ill for 24 hours, but fortunately he did not contract malaria;
5. Elias in the movie poster holds his hands high in the air. This is an imitation of a 1968 photo of Art Grispan.
