Alternate Uniforms
Press L + R when choosing a team in exhibition mode.
Mascot Costumes
To get mascot costumes you have to beat season mode without losing. (You have to beat the game with whatever teams you want because it only gives you the mascot of the team you beat the game with.)
Easy wins
When u want to play a game go on options and for player 2 (the comp) if your playing one put that white bar all gone. this will make them more tired and u will get better pitches to hit I once did a no-hitter with that on.
Miller Park Slide
If you play at Miller Park in Wisconsin when the home team hits a home run their team's mascot will slide down Bernie Brewer's slide.
New Reds Park
When you play any game at Cinergy Park, when you hit a homerun you can see where the new Great American Ballpark is going to be built at.