All Missions Open:
At the 'Press Start' screen, enter X, X, White, White, Y, Y, White, X, Y, Y, X, White.

Extra Money:
At the 'Press Start' screen, enter Y, X, White, Y, X, White, X, X, Y, White, X, Y.

Farm Road Shortcut:
On Farm Road 109, if you are in the Jeep Liberty Sport; you don't have to memorize the pattern of the train to take the shortcut across the train tracks. With the Jeep Liberty Sport you can almost always take the shortcut even if the train is coming. You just go to the right side of the tracks and you will almost always make it across.

Thanks to Revolution readers seth miners, Brian Smith and RYAN!