Elmer started the season with the Cubs wearing Number 8 on his jersey, but had Number 4 in the Series game.
In the gambling house, Elmer Kane consistently loses while betting on number six at the craps table, but one of the rolls was clearly called by the dealer as one, two, three.
In the final World Series game with the Yanks at bat and Elmer playing second, the bases are loaded and Elmer has trouble finding the ball in a huge puddle of water when it's hit toward him. You see three base runners cross home plate, but only two runs are posted on the scoreboard.
Under the rules of baseball, once a player has been removed from the game, he cannot re-enter it.
In the final World Series game the Chicago Cubs and New York Yankees are seen playing in the pouring rain. The field is muddy and there are deep puddles of water. Generally, Major League Baseball teams will continue play in light to moderate rain but will suspend play if it is raining heavily or if there is standing water on the field.
The onscreen credits read "based on a play by Ring Lardner and George M. Cohan," but the Internet Broadway Database (IBDb) lists Lardner as the writer of the play and Cohan as the producer. They get their credits from the original playbill.
When Elmer is playing at second base in the last game in the rain, there is a large mud puddle near the base. In the longer shots, the puddle is not there.