Factual error: The film takes place in the Thirties. The song "You are My Sunshine" is featured, but was not recorded by Jimmie Davis (its composer) until 1940. [Acknowledged by the directors]. (00:11:15)

O Brother, Where Art Thou? (2000)
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Directed by: Joel Coen, Ethan Coen
Starring: John Goodman, George Clooney, John Turturro, Holly Hunter, Tim Blake Nelson
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More mistakes in O Brother, Where Art Thou? More quotes from O Brother, Where Art Thou? More questions & answers from O Brother, Where Art Thou?
Ulysses Everett McGill: What'd the devil give you for your soul, Tommy?
Tommy Johnson: Well, he taught me to play this here guitar real good.
Delmar O'Donnell: Oh son, for that you sold your everlasting soul?
Tommy Johnson: Well, I wasn't usin' it.
More trivia for O Brother, Where Art Thou?
Question: The only way that the valley could be flooded by rampaging water is that a dam was broken up river. Otherwise the water rises very slowly. Does the movie explain this? If so I missed it. In which way was that river flooded?





Answer: Probably they have dismantled the coffer dam that was used while constructing the main dam. Hence, the flooding.
Good and reasonable last resort explanation - have the Coens ever addressed it?