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Director Joe Wright imagined that Cecilia would not be sexually experienced and losing her virginity to Robbie in the library scene, even though a historian informed him that given the time, place, and her background, she probably would have been sexually active during her college years.
Only eight U.K. military ambulances from World War II remain, and this movie made use of them all.
Director Joe Wright had wanted Keira Knightley to play the role of Briony in her late teens, but Knightley immediately liked the character of Cecilia, and also wanted to get away from playing girls on the brink of womanhood and play a more mature character for once.
The small English town of Redcar stood in for the French city of Dunkirk, and the Dunkirk set built there was the most expensive one in this movie, costing an estimated one million pounds sterling.
Saoirse Ronan was only 12 years old when this production began shooting and turned 13 by the time she received her first Oscar nomination.