DEBUGLEFT:
Makes your ball go left while it is in the air, or reduces the ball's speed to 0 if on the paddle.

DEBUGRIGHT:
Makes your ball go right while it is in the air, or reduces the ball's speed to 0 if on the paddle.

FLIPAD:
Changes the picture on the ad in the upper right corner of your screen. On mine it shows various Logitech products since I got the game with my steering wheel from Logitech.