Nanahara's hideout is light by candles, has intense heat and he questions the intent of the people sent to kill him, just like Colonel Kurtz in 'Apocalypse Now'.
each of the contestants in 'BR2' are marked with a neck collar which explodes if the stray too far from their numbered partner, or if their partner dies, or if they try to remove the collar. this is the same as the film 'Deadlock'.
in 'BR2', Mission 1: The landing, is a direct copy of the opening normandy beach invasion from 'Saving Private Ryan', including the same style boats, beach, and hilltop enemy hideout. It is also shot with the same handheld, step printed cinematography used as 'Ryan'.