When you go to visit A.J. in the hospital, look around first there is plenty of loot to find. (you can avoid the room he is in by looking through the windows in the doors, you will see tony through them) Go beat up the guy in the bathroom and rip off his phone. Look down the hall, some guy in scrubs will go into a room, follow him and when the time comes be tough with him (he will be down the hallway all by himself, he is stealing NO2 from the hospital). A guy on a stretcher will tell you where to get his inhaler, go get it for him (you can't do this until you beat up the doctor)you gain some respect but nothing else, just good kharma I guess. Then ride the elevator down and speak to the woman by the vending machine, talk smooth, get cash.
A.J. in the hospital part 2
Down the elevator by the waiting area is a woman who needs her pills, talk smooth, go to the desk and talk tough to the guy, then go back to the lady and get cash.
Eventually a doctor will send you down to get pills from a pharmicist, he sticks you with a needle (jerk!). Beat all three of him and you will get call (yes I said all three of him).
P.S. Don't shoot at him there is some public activity going on, don't worry he is a lightweight, just knock him down with the stuff in the room.
Back at the Gym: Save A.J. mission
When A.J. hides in the gym and "the dreds" attack just as you are about to walk out the door, go ahead and shoot at them. It is all clear, no public around. Its also a pain to fight all three of them at once.
Health inspector at meat store
Be tough with the health inspector at the meat store when this comes up. don't be afraid to be tough with this guy or else you wont get respect.
Infinite Ammo
Hold L2 + R2 and press Circle, Square, X, Square, Triangle(2) during gameplay.
Infinite Respect
Hold L2 + R2 and press X, Square, X, Square, Triangle(2) during gameplay.
Take Loot
Everytime you are on a mission, look around a bit. Sometimes people drop things (cellphones,wallets, cd players, ect.). If an option pops up, 'Take loot', then take the option and steal that loot. the loot automatically becomes cash for you. Don't be afraid to look around someplace, it might get you some extra cash.
Unlimited money
After the mission where you must dump Mario's body, you will find yourself at a casino. There are two pieces of loot you can collect: a cell phone near the slot machines, and more importantly some credit cards over at the bar. The cell phone is only worth a few hundred dollars, but the credit cards are worth almost $1,000. After collecting these items, use a slot machine. Exit out of it as soon as the slots pop up. You will find yourself back in the casino, and the cell phone and credit cards will be back in their original locations. Keep collecting them repeatedly to get as much money as desired.