Continuity mistake: Near the start, when the kid is holding the card of Babe Ruth in his hand, the position of his fingers on the card changes between shots.
Continuity mistake: When Spencer Tracy takes Katharine Hepburn to the baseball game (about 20 minutes into the film), several plays supposedly from that game are shown. Some of the plays take place on a diamond that has a well manicured dirt path from the pitchers mound to home plate, while others take place on a diamond with an all grass infield and no path.