Factual error: The third member of the Yankees with a prominent role in the film is Bob Cerv (roommate of Mickey & Roger). In the film, he is with the team from Opening Day. However, Cerv was actually acquired by the Yankees in May of that year.
Factual error: In the lounge scene after Mickey leaves the table, Whitey says that Mickey was 18 years old when he came up to the Yankees in 1951. Mickey was born in October of 1931, and that would have made him 19-years-old in the spring of 1951.
Factual error: There is a scene where a fan throws a set at Maris. This did not happen in 1961, but during the 1962 season. It was during the 1962 season that Yankee fans turned on Maris.
Answer: Actually Maris was MVP the previous year, 1960.