Factual error: Phil Lowenstein, the navigator, is hungover when boarding the Memphis Belle. It is obvious to all concerned that he was severely intoxicated the night before the mission. He'd be grounded on the spot and confined to quarters – and this happened a lot in real life.
Factual error: At the end of the movie when Hawkins is cutting the guy's throat underwater no blood is visible.
Factual error: When Robert Redford looks at the radio he finds in Lena Olin's car, the radio's ID plate has a serial number beginning with 67-, which means it was paid for by the U.S. government with funds from fiscal year 1967 - eight years too new for a story from late 1958.