Factual error: As Wendell and Jackie are driving in the car, Jackie turns the radio on to put a hiatus on their discussion. As soon as he turns it on, sound issues forth, but in the 40's radios used vacuum tubes, which required a warm-up period.
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Suggested correction: Once the tubes are warmed up, they will tend to stay warm for a period of time even if the radio is turned off. It's possible the radio had been turned on and warmed up before this scene.
