If you are playing with your friend and just realized that your shot is not going to be the way you had planned it, press Start before all of the balls stop rolling. Scroll over to "Change Turn" and select that. The computer will think your friend just passed his turn and you get to shoot again. It might be better to do this when your friend glances away!!!!
This will allow you to repower a shot against the computer. During gameplay, if you overshoot or undershoot a shot you may retake it. While the computer is taking it's turn press left for instant replay. Before the replay starts hold R to view the shot from above. Then hold A to rescue the shot. While holding A you may retake the shot using a different level of power. Just shoot it like you normally would. This allows you took repower a shot but not change your angle.
While the computer is taking its shot, switch to overhead view (R button) and then you can rotate the computers cue stick!
Pressed the L Button. Lines appear that show where all the balls would go up to a certain point! These lines only work in a couple modes like freestyle, and 2 player versus.