Some of the people and situations may have been inspired by Gaspar de Carvajal's account of an earlier Amazonian expedition, although Carvajal was not on the historical voyage represented in the film.
Vissa av personerna och situationerna kan ha varit inspirerade av Gaspar de Carvajals berättelse om en tidigare expedition i Amazonas, men Carvajal var inte närvarande vid den historiska resa som avbildas i filmen.