For the code to work you have to be in a 
destination driving mission. 
  After pausing the game pick City map and press Down, Up, Down, Up, A.  
Also reported as: Pause The Game When Your Out Side In The City Then 
Press Start And Go To City Map Then Press Right, Left, Right, Left, A. 
Also reported as: Pause The Game When Your Out Side In The City Then 
Press Start And Go To City Map Then Press 
Up, Right, Down, Left, Up, A

- Rosy in lingerie

Enter "TFAN" as a license plate. Note: Hold L + R when entering the letters
and selecting "OK".

Go around checking everyone for drugs and weapons to get +1 Good Cop. Also, go to the
Hancock Park area in the middle of the map. On a street corner at 2nd and Citrus Ave, you
can frisk just about anyone close to or moving to the intersection and almost always finds
drugs or weapons on them. Additionally, to increase your Good or Bad Cop rating easily,
replay a stealth mission and choose your attack accordingly.

- Commando

Enter "FATT" as a license plate. Note: Hold L + R when entering the letters
and selecting "OK".

Collect 30 bones during a game to unlock Snoop Dogg. Note: They are marked in
yellow on the map.

- get Rosa

While driving on the grey D (direction) pad press left and right to use 
the hydro's. When the front is up just keep tapping A, with timing, and 
it will bounce down the street.

At the map screen press R, L, Up, Right, Left, Down, Z, Z, A, Y, X, 
Y. A sound will confirm your entry. Do something that saves your 
game and exit to the main menu. From your missions page you can 
highlight the snoop dogg head in the left hand corner to play "DOGG 
PATROL".

For the code to work you have to be in a 
destination driving mission. 
  After pausing the game pick City map and press Down, Down, Down, 
A.  For this to work you have to be in a car before opening the 
city map.

When an opponent is dazed, you can hit them hard into the wall with a finisher to do even
more damage.

When you are supposed to flee from other cars shooting at you, look for big open spaces
like the Staples Center parking lot and drive through them. The people chasing you will
stay on the road and go all the way around, giving you a good chance to escape.

- SWAT Officer

When the dragon is about to use his fire attack, use you manual aim to shoot it in the
mouth, thus avoiding its fire and tail attacks. Note: Do not bother trying to shoot
him while he is swimming in the lava.

- Street Gangster

After beating up the chefs, a zombie will appear. Go near a stove and kick it. Hopefully,
you have not destroyed it while fighting the chefs. The stove will explode and both of you
will catch fire. The zombie will get greater damage than you. Repeat this with the second
stove. If the zombie is still alive, knock him into the fire. Note: It is not
possible to kill the zombie with physical attacks.

Enter "TATS" as a license plate. Note: Hold L + R when entering the letters
and selecting "OK".