The Dingers Superteam can also come to the party during batting practice.
To activate this, press L1 + L2 + R1 + R2 (simultaneously) at
the batting practice team selection screen and the Dingers will appear next to the Cooperstown Legends.

Unlock Bonus Teams
To unlock the Dingers and the Islanders go into the Exhibition Mode and tap R2+L2
at the team selection screen. Once you hear a gong sound, you will then be able to select either team.
If you don't hear the tone at first, tap the buttons until you do.

Unlock Dingers in Batting Practice
To get the Austin Dingers, in Batting Practice enter that mode
and then press R2+R1+L2+L1 at the team selection screen.

Easy Stealing
Whenever you have a man on 1st and 3rd steal 2nd because
your opponent always will throw to 3rd!

Extra Jerseys:
In exhibition mode press L1+L2 at the same time to enable alternate jerseys

Aluminum bats:
To get aluminum bats enter in the cheat area "Hollow bats".
Now aluminum bats will be available

Mr. Met:
If you play at Shea Stadium. In between innings you would see
Mr. Met dancing on top of the Mets Dugout.