While playing, enter: Z, A, B, Y, R, X

This is a cool thing that makes Gromit run up a wall and do a backflip. What you do is run at a wall and press the "R" button right as you are about to hit the wall. This normally is a roll, but when running at a wall it is the back flip. This is a pretty stupid tip, but may come in handy at the proper time. And of course it looks cool.