“If there's a role you're playing and there's a great deal of material to explore because the person was real then it's a completely different preparation time and message to playing someone fictional.”
Source : "Emma Thompson Talks SAVING MR. BANKS, Her Preparation Process, Getting Input from Richard Sherman, Terrence Malick’s VOYAGE OF TIME, More". Interview with Steve 'Frosty' Weintraub, collider.com. December 20, 2013.