All movies
At the main menu or while the game is paused, press Circle, Square, Circle, Square(2), L3

Unlockable Movies
Successfully complete the indicated mission or collect the indicated number of film reels to unlock the corresponding movie:
Regarding Sollozzo: "The Alley" mission
Mr. Bonasera: "The Enforcer" mission
Meeting With Sollozzo: "A Grave Situation" mission
Sicilian Sign: "Sleeping With The Fishes" mission
Five Shots: "The Don Is Dead" mission
Sonny And Tom Disagree: "Intensive Care" mission
Sonny And Tom Argue Again: "Fireworks" mission
Mr. Woltz: "Death To The Traitor " mission
Trigger Too Tight: "Horseplay" mission
Mattresses Montage: "A Recipe For Revenge" mission
Where's Michael?: "Now it's Personal" mission
Spoiled Guinea Brat: "The Silent Witness" mission
Carlo Learns A Lesson: "Sonny's War" mission
Are You Ready To Do Me This Favor?: "Change Of Plans" mission
The Don's Demise: "Order To Kill" mission
Carlo Goes For A Ride: "It's Only Business" mission
The Baptism: "Baptism By Fire" mission
Johnny Fontane: Collect 10 film reels
Don Sends Luca On An Errand: Collect 20 film reels
Luca's Demise: Collect 30 film reels
The Don Is Dead: Collect 40 film reels
Whack Paulie: Collect 55 film reels
Good Morning Mr. Woltz: Collect 70 film reels
Sonny At The Tollbooth: Collect 85 film reels
Sorry Sally: Collect 100 film reels

$5,000
Pause the game and press Square, Circle, Square(2), Circle, L3. Note: There is a five minute lockout before this code can be re-enabled. To bypass this, save the game after the code has been enabled, quit the game, then reload your saved game.

Full health
Pause the game and press Left, Square, Right, Circle, Right, L3. Note: There is a five minute lockout before this code can be re-enabled. To bypass this, save the game after the code has been enabled, quit the game, then reload your saved game.

Full ammunition
Pause the game and press Circle, Left, Circle, Right, Square, R3. Note: There is a five minute lockout before this code can be re-enabled. To bypass this, save the game after the code has been enabled, quit the game, then reload your saved game.

Infinite money
Enter a hotel, nightclub, shop, etc. that you own. Smash the cash register and collect the money. Walk out the door, then walk back in. The cash register should be fixed. You can repeat the process as many times as desired. It is a slow way of getting money, but sometimes you will get $10,000.

Infinite ammunition and $1 million
Reach the "Don Of New York City" rank at a 91.5% game completion to get one million dollars and unlimited ammunition for all of your guns only. Bombs, dynamite, and Molotov Cocktails are not unlimited, and melee weapons can still wear out. To become the Don, you must take over all businesses and rackets, then complete the contracts on the other families top Bosses.

No heat when stealing cars
Reach the "Underboss" rank to have no heat when stealing a parked car.

Losing police quickly
If you commit a lot of damage and/or kill a lot of people, you will get wanted stars. Once you get enough stars, the police will chase and shoot you. To lose them, just move to a different area and all of your stars will immediately go away.

Safes
You must blow up all safes to become Don Of New York City. Blow up all the safes when you are taking over businesses that have one. By doing this you will not have to search for safes after you completed most of the missions. Also, you will get an money, 1,000 Respect, and dynamite by blowing them up.