Ian Richardson and Rosalie Crutchley, who appear respectively in this film as a bishop and Father Quixote's housekeeper, played similar roles in another Don Quixote film, Man of La Mancha (1972). In that film, Richardson played the village priest and Rosalie Crutchley his housekeeper.
Alec Guinness and Leo McKern starred as companions again a few years later in A Foreign Field (1993).