To unlock the bonus movie, get all three endings (poor, average, and best) by successfully passing all of the episodes, including the alternate ones. This extra movie is just for fun, and it shows Masterson and Nick doing something silly at the Gulag Club.
True Crime the Movie billboard
Somewhere in the game there is a sign that says "True Crime:Street of L.A.: The Movie, Fall 2005".
Play as snoop dogg
Collect Thirty(30) of the Golden dog bones form around town.
Show nick's coordinates
At the map screen press A, B, X, Y to enable the code.
Extra Car Mass
At the map screen (when in a car) press Down(3), A to enable the cheat.
All Hand to Hand Combat Upgrades
At the map screen press Up, Down, Up, Down, A to enable the code.
All Driving Upgrades
At the Map screen press Left, Right, Left, Right, A to enable code.
All weapons upgrades
At the map screen press Right, Left, Right, Left, A to enable the code.
Change Nick's Appearance
When naming your game file (when you are making your license plate), put in the following names. Hold L and R when you enter and confirm the name.
Look like the Chief - B1G1
Look like Rosie - ROSA
Look like Rosie in lingerie - HURT_M3
Look like a cop - FUZZ
Look like a police officer - FATT
Look like a SWAT officer - SWAT
Look like a commando - M1K3
Look like a female worker - HARA
Look like a male worker - HARA
Look like a female punk - B00B
Look like a male punk - MNKY
Look like a gangster - TFAN
Look like a boxer - BRUZ
Look like a gambler - MRFU
Look like a butcher - PHAM
Look like a biker - HAWG
Look like a S&M donkey - JASS
Look like Ancient Wu's concubine - TATS
Look like a pimp - PIMP
Look like a hobo - B00Z
Look like a corpse - J1MM
All Fighting Moves
At the map screen, type in: Up, Down, Up, Down, A.
Impound All Garage Cars
At the Map Screen, type in the following: Up, Right, Down, Left, Up, A.