Archive footage was used for the 1948 game with the Boston Braves, the 1948 World Series, spring training in Tucson, Arizona, USA and a game in 1949. The Cleveland Indians received no pay for its participation in the film, but the individual players were offered a percentage of the profits.
The ballpark shown on the "spring training" section of the movie is actually League Park in Cleveland (on the corner of E.66th and Lexington), which was the home of the Cleveland Indians from 1891 until 1946. When the movie was shot in the spring of 1949, the park was being used by high schools and amateur baseball teams in the spring and summer and high school and semi-pro football teams in the fall. Most of it was torn down in 1951, but small part still remains today as does the field itself, where little leaguer's now play where the greats of the game made their names.