At the screen where you buy new parts for your POD, press [Shift]
+ [F4] + 4 for an extra $1000. Note: This may only be done five times.

3000 Smackers!:
     When  you  are  in  the buy parts place, get to what you want and
then  (in  this  order)  press "ctrl"-"f4"-"4". Note: looks like other
code but is not, so press "ctrl" not "shift".

Race as Sebulba:
     Successfully  complete  the Galactic Circuit to unlock Sebulba at
the racer selection screen.

Taunt opponent:
     Select  tournament mode. Highlight "Start Race" and press [Space]
at the menu. An intermission that features your character and opponent
taunting  each  other  will  appear.  Note: This will not work if your
character is the track favorite.