Paulo José, Flávio Migliaccio and Leila Diniz previously appeared in Todas as Mulheres do Mundo (1966).
Early in the movie, there's a scene where the character played by Leila Diniz says to Paulo José that she had a nightmare the night before, to which he asks if she dreamed about a plane crash and she replies she's afraid to fly. Four years later Leila Diniz actually died on a plane crash on a New Delhi flight returning to Brazil.