To be honest, though, I thought the acting -- other than Welles -- was lackluster and the old-age makeup was pretty bad.
I obviously can't divroce myself from my knowledge about film history but it seems like an ebullient and fun piece of 'can I top myself' cinema. I always thought Welles was a hammy actor but the others...Joeseph Cotten and especially Dorothy Comingore were wonderful. And Cotten thought at the time that his old age make up was terrible! Listen to Ebert's commentary on the DVD. It's illuminating from start to finish.