All Star Team:
Press Up, Up, Down, Down, Left, Right, Left, Right to unlock allstar teams in cup mode.

Bonus Teams:
Beat the game with all the leagues and cups, while playing on the hard difficulty setting. The European All-Star Team, World All-Star Team, Classic European All-Star Team, and Classic World All-Star Team will be unlocked. Beat Olympic mode with Japan to unlock the All Golden Japan team.

Bonus Cup:
Win all the normal cups to unlock a bonus cup.

Bonus Stadium:
Win the Konami Cup under any difficulty setting to unlock the Clubhouse stadium in exhibition mode.

Listen to the Commentary in Training Mode:
If you are tired of listening to the always repeated drums in training mode, pause game play. Select "Audio Settings" and turn off the play-by-play option. Resume the game, then pause again. Select "Audio Settings" and turn on play-by-play. Return to the game and you will hear Jonh Kabira.

 

Thanks to Revolution reader Yosia Charisma!