In the book, Maurice, Louise and Henry all have dark hair. In the movie, all three have blond hair, which makes even less sense because at least two of three actors actually have dark hair in real life.
In the book, it is only implied that Izidora knows about Miguel Diaz's secret El Coyote identity. In the film, she is aware of him being El Coyote and openly pokes fun of him, but he only kills her for that during the court.
The first "Western" film to be filmed in the Soviet Union by Soviet director.