Enter the following codes after hitting pause during gameplay(if done correctly, a sound will be heard):

Slow CPU Cars:
Right C, Up C, Left C, Down C, Right C, Up C, Left C, Down C

2X Speed:
Left C, Down C, Right C, Left C, Up C, Down C, Down C, Down C, Down C

Any-Object:
Down, Down, Up, Up, Right, Right, Left,

Big Bounces:
Left C, Right, Right, Down, Up, Down, Left, Down, Down

Behind View:
Left, Right, Left C, Right C, Left, Right, Left C, Right C

Debug Mode Effects(you must first enter the code below!):
To access the codes below hit pause during gameplay and press:
Left C, Up, Down, Down, Left C, Right C, Right C, Up C, Down C

The following codes can now be entered during gameplay:

Destroy All Cars:
Hold X + Up C + Right C + Left C

Automatic and Instant Race Win:
Press Z and Down C

Make Human Player a Computer Player:
Hold Z and press Left C

Camera Zoom:
Hold Z and press L or R

Change Camera Angle:
Hold Z and press Up, Down, Left or Right