At one point actor and writer Eduardo De Filippo recalls his cinematic interpretation of Pulcinella, but he gets the title of the film wrong and calls it 'Ferdinando Re Burlone'. Such film does not exist, however Eduardo De Filippo did play Pulcinella in Ferdinando I° re di Napoli (1959). He was likely thinking to a former Italian film, The King's Jester (1936), in which he didn't work.