Revealing mistake: Signs for Baltimore based businesses are clearly visible in the stands, such as "Sheraton Inner Harbour" and various Baltimore banks.
Revealing mistake: Before the fight breaks out in the dugout, Willy Mays Hayes makes a comment to Rick Vaughn, causing him to tackle Hayes from behind. If you notice just before he tackles him, Hayes shoulders stiffen up, preparing to be hit.
Revealing mistake: In all the baseball scenes the stands are filled mostly with cardboard cut-outs of people, with a few real people mixed in.