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Soon after the film began, Cash walked onto the streets of Memphis and found a digital meter on the side of the road.
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The film opened in 1944. Cash listened to a show about Joan Carter from the radio. The show claimed that Joan was only 10 years old, but in 1944 Joan was 15 years old.
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All the tracks in the film were sung by Phoenix and Witherspoon.
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From the moment the signing was confirmed to play, Phoenix kept playing the guitar, reading autobiography, listening to records, watching videos, and immersed himself in Cash's life track.
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Witherspoon learned to play the harp before filming the film, and got inspiration for his performance by inspecting Joan's closet and other details of life.
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Witherspoon specially went to meet Cash’s children before the filming. One of them said that her breasts were not full enough. She immediately ran to the costume designer and asked to solve this problem with styling.
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Cash was a well-known drinker during his lifetime. In order to make Cash more real, Phoenix forced himself to raise the level of alcohol.
Walk the Line behind the scenes gags
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[John and June on stage before an audience, away from mic]
June Carter: John, I'm not gonna sing that song, it's inappropriate.
[John signals to start music]
June Carter: I recorded it with my ex-husband,
[music starts]
June Carter: and I'm not gonna sing it.
Johnny Cash: There's no better way to put it behind you.
June Carter: I'm not gonna do it!
Johnny Cash: June, just sing.
[John and June begin a duet]
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Johnny Cash: I think it's about time, June.
June Carter: Time for what?
Johnny Cash: For you and me... to get married.
June Carter: Go to sleep, John.