Subtle homage to the stars' previous films? (a film for film buffs)

I wonder if anyone picks up on these subtle homage to the stars' previous films?

Gassman:
Il Successo (1963): knocking balls off billard table before entering garage, same lonely rich guy character

Sandrelli:
I Knew Her Well (1965): want to be an actress, cinema usherette outfit
The Conformist (1970): similar dress and makeup in the La Dolce Vita scene