In Arcade/Time Attack/Team Battle/VS mode, press Select during the game and you will see the names of your attack moves. Every time you enter a command attack, its Japanese name will be displayed.

Internet Ranking password -

To recieve your internet ranking password, first complete Time Attack, Survival, Force, or Training mode. Hold down square and triangle and press up+right (right diagonal) on the control pad. You can then submit it to Namco Japan's Tekken 4 webpage to see how you rank against the rest of the world.

Ling's School Outfit -

Finish Story Mode using Ling and you can select her School Outfit by pressing triangle when selecting her.

Fight as Panda -

Highlight Kuma at the character selection screen, then press RP (Triangle) or RK (Circle).

Fight as Violet -

Highlight Lee at the character selection screen, then press RK (Circle).

Dojo stage -

Successfully complete the game in Tekken Force mode.

Theater mode -