View ending sequence:
Select the story mode option at the title screen. Press Start and choose any character. Immediately press Select to pause the game, then press Up, X, Left, Y, Down, B, Right, A, L, Y. The screen will fade and the ending sequence will begin.

Secret moves:

Mr. Karate
Press X while charging. He will stop, bend his upper body, and execute a strong punch. While bent, no punch or kick can hurt his upper body.
Press Y while charging. He will stop, bend forward, and execute a high kick. No punch or kick to his upper body will affect him.

Ryo Sakazaki
Press Down, Down/Right, Right + R + X to execute a 2.8 second power attack when his strength gauge is low.

Lee
Press Forward, Back, Down/Back, Forward, X to move up and down with blades out.

Jack
Sweep the D-pad Counter-clockwise from Back to Forward, R.

Mr. Big
Press Forward, then sweep the D-pad Counter-clockwise from Back to Forward, X.

John
Press Down/Back, Forward + R.

Todo
Sweep the D-pad Counter-clockwise from Back to Forward, X, R.