I'm watching The Godfather which has to include one of the greatest casts ever. Marlon Brando, Robert Duvall, Al Pacino, Diane Keaton, John Cazale, James Caan etc. The star power is just crazy and even the actors in the smaller roles are all so perfect for their characters. I can't think of one performance that I didn't enjoy.
The Green Mile is another for me.
Which films do you think have the best casting?