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In page The Discreet Charm of the Bourgeoisie:

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Buñuel cast many actors whom he had worked with in the past, such as Fernando Rey and Michel Piccoli, and catered their roles to their personalities. He had more difficulty casting the female leads and allowed actresses Delphine Seyrig and Stéphane Audran to choose which parts they would like to play, before changing the script to better suit the actresses. Jean-Pierre Cassel auditioned for his role and was surprised when Buñuel cast him after simply glancing at him once.[4]