Unlocking All Characters
Keep beating Story Mode with different characters until everybody but Devil Jin is released. (see below for unlocking him)
Anna Williams: Beat Story Mode two times.
Baek: Beat Story Mode three times.
Bruce Irvin: Beat Story Mode 4 times.
Devil Jin: Complete Tekken: Devil Within mini game in Tekken 5.
Kuma: Beat Story, Battle or Time Attack mode 5 times
Ganryu: Beat Story, Battle or Time Attack mode 6 times
Heihachi: Beat Story, Battle or Time Attack mode 8 times
Mokujin: Beat Story, Battle or Time Attack mode 7 times
Roger Jr.: Beat Story Mode with Kazuya.
Gaining Ranks Quicky
In order to gain ranks quickly you must play opponents of the same rank you are, similar to the arcade version. When defeating AI opponents of the same rank as your character it usually only requires 3 to 5 wins to get a promotion. After your fight has ended in Arcade Mode you can select one of 3 opponents with the directional pad, you can't always select an opponent with the same rank but do so when one is available.
Alternate Mokujin Sounds
To hear different hit sounds for Mokujin, hold DOWN on the D-Pad or joystick before a match in which you are controlling him. Mokujin will now sound like a block of wood when damaged.
Arcade History Dip Switches
While at the Press Start screen for any of the Arcade History games, hold the select button and you will be given a list of dip switches. You can use these for such things as changing number of rounds or unlocking hidden characters, such as Baek in Tekken 2.
Kill a Frog - Easter Egg
In the Secret Garden Stage, if you look closly at the ground somewhere you will notice there is a Frog. If you or your opponent gets knocked in the air and lands on the frog it will die and its angel will float upward.
Getting Expensive Items For Free
Get a bunch of the high priced items for free when you play 'Devil Within' a second time after you have already completed the quest. Various expensive items will be scattered around throughout the game.
Activating Theater Mode
The Theater Mode gets opened up after you beat Story Mode once with whatever character. At that time you are able to listen to the stage soundtracks, view the movies of the character you just beat Story Mode with and the attract movies (Arcade Intro, PlayStation2 Intro, and E3/TGS trailers). As you beat Story Mode with each character the movies will become available in Theater Mode. Getting all movies requires you the beat Story Mode with both Kuma and Panda as well as Christie and Eddy.