USA Today ran a nice piece late last week on Ian McDiarmid's recollections of playing the Emperor in Return of the Jedi. From the article:
The actor recalls a part of him did make an immediate impression in the initial meeting.
"As I was leaving and just going out the door, George said, 'Oh by the way, great nose.' I thought that was an unusual thing to say, but then I thought maybe that's a good sign. Maybe they need a great nose," McDiarmid says, laughing.
"You can work out why he said that because that was about the only part of my face that was actually left. And of course it peeked out rather nicely from below that black hood. Presumably, they were going to give you a prosthetic one if it hadn't but they got it for free."
USA Today: 'Star Wars' Emperor recalls his first day on the job