Random team:
Hold L + R at the team selection screen.
Interfere with opponent free throws:
Rapidly tap L + R + A + B + X + Y while an opponent is shooting a free throw on your team's home court. The crowd will go wild and reduce the chance of a successful shot.
Secret players:
Select the edit players option, press B to display a player's file, and replace his name with one of the following entries. Note: "_" indicates a space. The displayed statistics and picture will change to match the new player. The trade players option may be used to move the modified player to the roster.