Alternative Starting Place
At the character selection screen press R then let go. The hold R and select you character. You will start in a different place in the stage you selected (either Arcade or Original).
Submitted by Nate_Kroll. 

Bike Pulling a Wagon
When you select a character push both triggers rapidly about 5 times and then your driver will be riding a bike pulling a wagon.
Submitted by John. 

Disable Arrow Indicators
Before the character selection screen appears, hold R + Start. If you entered the code correctly, the message 'No Arrows' will appear in the lower left corner.
Submitted by Nicola_Panaro. 

Expert Mode
Before the character selection screen appears, hold L + R + Start. If you entered the code correctly, the word 'Expert' will appear in the lower left corner. No stop or arrow indicators will appear in this mode.
Submitted by Nicola_Panaro. 

Special Taxi
At the character selection screen, quickly press L, R, L, R, L, R or L + R, L + R, L + R. Then, select a character to drive a bike instead of a taxi. Alternatively, complete all sixteen Crazy Box levels to unlock the Special Taxi for each character, which is selectable in crazy box, arcade, or original modes. To select the bike in crazy box mode, scroll to the right of Gus at the character selection screen. To select the bike in arcade or original mode, press Up at the character selection screen.
Submitted by Nicola_Panaro. 

Go to: Crazy Taxi Info Page | nGaming Home Page.