Other mistake: In the beginning of the movie, the catcher is in the dugout eating a hotdog in front of his manager. Pretty gutsy (or stupid) thing to do, since no manager would ever allow his players to eat something like that right before or during a game.
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Suggested correction: Defying a custom isn't a movie error. Also, considering that dietary restrictions for a Single-A ballclub in 1987 were likely far looser than today, it's possible the manager doesn't actually care.
