Blunt read the script three times, trying to decide if her character was crazy or not, eventually settling on "she was not crazy but was in a constant state of anxiety that she would become crazy."
Colin Firth plays a former professional golfer in the film, yet he had never seen a single golf swing prior to filming.
Colin Firth and Emily Blunt portray Americans in the film, both obscuring their original British accents.
There wasn't much rehearsal process while filming, as Firth claims they had all had a preconception of what a scene was for.
The film features extensive use of ambient and natural lighting, an aesthetic of director Dante Ariola.
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