Maintain Perfect Stats
One way to maintain perfect stats in the game is to exit out and return to the iphone home screen. When you reload the game, start a new game. The old game will not count as a loss. If you exit out of the game with the "in game" menu, you will get the loss for the game. The glitch allows you to keep a perfect record.
Never Pay Rent
After you roll the dice, if you're going to land on an undesireable property, just exit out of the game to your main iphone screen. When you reload the game, just resume your old one and you will be on the property and still have all your money. This also will work if you are about to land on the "go to jail" spot, Chance and Community Chest.