Empty Stadium
Before game one of the World Series, we see Buck at the Reds stadium standing at home plate with his bat. There's no one there. We see a red flag waving on the bottom left of the screen as the shot hovers above him. This symbolizes that his conscience has been weighing on him and the only place where he can clear his head is at the ballpark, a place for him, where the troubles of the world are silenced. This all happens prior to knowing if he will choose to partake in the fix or not.
Blood on His Lapel
Joseph Sullivan is one of the men who conspires to fix the Sox series. All he needs is Rothstein's money, and when we see him enter wearing his white suit we see on his lapel a red rose. This symbolizes that though he appears to have clear intentions, there is blood on him. And, as we later see, he is one of the first to betray the team when he takes their cut and gambles it for his own earnings.
For Love or Money
We see Buck with the kids from his neighborhood early on in the film. They stop him and ask if he'll teach them some tricks. He says he's tired and needs to get home, but he decides to stay and play with them. This symbolizes the the purity that Buck still holds for the game, a part of him that is still alive, though he has now become a working man in baseball in order to earn a living.
Left in the Dark
Just after Gleason has told Comiskey of the possible fix, we see Swede pass him in the hotel hallway. As he exits the light above him where he makes his turn goes out as Gleason stays in the light. The lighting in this scene is showing how Gleason, who's been at this business of baseball for some time is still working to stay above board, while Swede's ability to walk in what's good has gone.
Ticking Clock
Before game 7 we find Eddie in his hotel room in Cincinnati. Lefty, one of the other pitchers who's helped fix the series with his previous performances comes in. Eddie is holding a clock in his hands and the alarm goes off. It's telling us that Eddie knows his time is up, he can't play this fix any more. He sees clearly that the money that he got for throwing the game will never compare with what it mens to be a champion. And, the next day, for the first time in the series Eddie returns to his winning form on the mound.