During the shooting of the scene in which Corisco (Othon Bastos) and Rosa (Yoná Magalhães) kiss passionately, Yoná Magalhães' husband was sitting off-camera, right beside the two actors. During the interview taped for the DVD release, Bastos confessed he was really nervous about it, and wanted to ask the man to leave - but didn't have the nerve to do it.
In the scene where we see Manuel (Geraldo Del Rey) carrying a huge stone over his head while climbing Monte Santo on his knees, Del Rey insisted on carrying a real stone that weighted over 20 kilos - something that really worried director Glauber Rocha. After the shooting, Del Rey had to take 2 days off, as he wasn't in condition to show up.
Othon Bastos did three voices for the movie. Besides dubbing himself as Corisco, he did the voice for Lampião (whom Corisco had "incorporated) and he also dubbed Sebastião, the black God - although Lídio Silva played the character on screen.
The trivia item below may give away important plot points.
In the final "racing" scene with Manuel (Geraldo del Rey) and Rosa (Yoná Magalhães), the latter knew how methodic and demanding the former was (for instance, with the stone trivia above, and the fact that he wore the character leather clothes 24/7 to really feel how it was like to be in Manuel's shoes), she thought he would run into exaustion, and was not willing to be subjected to this. So, she conceived the character's fall on her own, searched for a cactus-free spot and threw herself on the ground. As this happened, Glauber Rocha screamed to Geraldo "Don't turn back for her! Keep running!".