Suggestions by @GretaGerwigStan
838 suggestions

Marcello Mastroianni
as Max in Viola bacia tutti (if it was made in the 1960s)
Ugo Tognazzi
as Nicola in Viola bacia tutti (if it was made in the 1960s)
Vittorio Gassman
as Samuele in Viola bacia tutti (if it was made in the 1960s)

Anouk Aimée
as Viola in Viola bacia tutti (if it was made in the 1960s)
Dino Risi
as Director in Viola bacia tutti (if it was made in the 1960s)
Clarence Nash
as Donald Duck in Symphony Hour

Pinto Colvig
as Goofy in Symphony Hour
Walt Disney
as Mickey Mouse in Symphony Hour
Bruno Walter
as Conductor in Symphony Hour
Deems Taylor
as MC (Maestro of Ceremonies) in Symphony Hour
Romana Maggiora Vergano
as Alba in Alla festa della rivoluzione (Parody)
Louis Garrel
as Pietro in Alla festa della rivoluzione (Parody)

Carolina Crescentini
as Maria Hardouin in Alla festa della rivoluzione (Parody)
Paolo Conticini
as Gabriele d'Annunzio in Alla festa della rivoluzione (Parody)

Lorenzo Zurzolo
as Giulio in Alla festa della rivoluzione (Parody)

Matilda De Angelis
as Beatrice in Alla festa della rivoluzione (Parody)
Giulio Base
as Director in Alla festa della rivoluzione (Parody)
Elijah Wood
as Frodo (Cameo) in Legolas
Rosabell Laurenti Sellers
as Eleonore in Legolas
Icona Pop
as Lesbians Goddesses of the Realm in Legolas