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It's not like you get up in the morning on the first day of shooting and say, 'I'm so smart today I'm going to determine every choice I make from now until a year and a half from now.' So it changes. You gain insights. The movie bucks you.

"Director Robert Schwentke Interview THE TIME TRAVELER’S WIFE". Interview with Steve 'Frosty' Weintraub, collider.com. August 10, 2009.
It's not like you get up in the morning on the first day of shooting and say, 'I'm so smart today I'm going to determine every choice I make from now until a year and a half from now.' So it changes. You gain insights.