Striving for a degree of historical accuracy, the filmmakers employed a consultant, Richard D. Hansen, a specialist in the Maya and assistant professor of archaeology at Idaho State University. As director of the Mirador Basin Project, he works to preserve a large swath of the Guatemalan rain forest and its Maya ruins. Gibson has said of Hansen's involvement: "Richard's enthusiasm for what he does is infectious. He was able to reassure us and make us feel secure that what we were writing had some authenticity as well as imagination."