The filmmakers scouted the country for a stadium to use in game scenes. They needed something nondescript with a pre-WWII feel and found it in Buffalo's War Memorial Stadium. The stadium, built in 1937 and demolished in 1988, had a shorter distance down the right field line than is shown in the movie. The stadium had been renovated prior to filming, which could explain the extra hundred feet displayed on the right field wall.
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