Dragon Ball Z: Budokai 2

You can make Master Roshi move on the loading screen by rotating the analog stick to increase his spinning speed. Once he gets up to a good speed, you can move the analog stick left and right to make him move. You can even make him jump up and down sometimes!

When selecting a stage to battle in, instead of using the A button, select the stage with the Y button. Some stages don't have a night version, but they may start off in a different part of that stage while choosing it with the Y button, like if you pick the Red Ribbon base with the Y button, you will start outside instead of inside.

Note: Some stages do nothing while picking it with the Y button.

If you defeath certain characters with certain other characters, you can unlock some rare capsules.

On stage 9, go to the spot where kid buu starts off at and dig twice. It's the middle spot on the right. You'll first recieve a random rare capsule and then the senzu bean.