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.
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.
Corrected entry: When Jackie Robinson is leaving the train station the US Flag has 50 stars, however that was 1947. Hawaii and Alaska were not granted statehood until 1959.
Correction: No, the flag only has 48 stars. On 50-star flags, the rows are off set and rows alternate between 6 stars and 5 stars. The flag seen at the station had the rows all lined up.