Taxi Bike:
In Arcade or Original mode, press and hold L, then R. Then let go of L and then R. Repeat only the second time let go of them at the same time.
Another Day Mode:
Press R at the character selection screen, then release it. Then, hold R and press A. The message "Another Day" will appear in the lower left corner to confirm correct code entry. This mode modifies various positions in the game. Have a nice time!

Disable Destination Indicator:
Hold L+START after choosing your time limit and before the character selection screen appears. The message "No Destination Markers" will appear in the lower left corner to confirm correct code entry. Hope it works for you!

Disable Arrow Indicators:
Hold R+START after choosing your time limit and before the character selection screen appears. The message "No Arrows" will appear in the lower left corner to confirm correct code entry. Good luck!