Fine shot adjustment: Hold L2 while adjusting the shot direction to move the pointer more precisely.
Look around table: Hold R1 while adjusting the shot direction.
Adjust camera angle: Hold L1 while adjusting the shot direction.
Overhead view: Hold Triangle while lining up a shot.
Backspin: Hold Circle + Up or Down to put backspin on the ball.
Side spin: Hold Circle + Left or Right to put side spin on the ball.
Change shot height: Hold Square while lining up a shot. This also can be used to make illegal shots. For example, hit the ball very far past the middle to chip it or break very fast to hit a ball off the table.