If you want to skip past the destruction derby, just press
left shift+v simultaneously and it will skip right by it.

DX

When riding on the motorcycle stop where you are for a couple of minutes and then a screen will come up and you will be able to choose a different vehicle than a motorcycle.

Raymond Kirby

When fighting on the old mine road hold LEFT SHIFT and V to automatically win the fight.

Juan Lube

Press Shift+ W to win the game

David

When you get to the part where the guy has the knife ask him TEN (10) times if you can see it and he'll let you.