In distant shots of Satchel Paige on the pitching mound, it is obviously a much younger (and bald) stand-in for Delroy Lindo.
At the end of the movie, in the Negro League vs. Major League All-Star Game, played in 1945, there is a 50-star flag on the flagpole (two close-up shots). In 1948 it should have been a 48-star flag.