In the passcodes section in options menu you can type in:

 JHGNRGAS     Access all levels
 FMRYLDAD     Dark side level
 EOWXZGAS     Team photo
 DIWMZIAR     Show credits
 HRDTOKIL     Advanced shields
 RQORACAQ     Access AAT
 LFZWKXAA     Unlimited lives
 XFIIYBAY     Swampspeeder
 JOBXXFAI     Art gallery
 RECTVBAH     Concert hall
 CXSJMIAA     Single shot kills
 ABVUSEAY     Heat seek function (use secondary fire)
 NASTYMDE     Harder mode
 FRBPTDAY     Sith infiltrator
 NIZWAGAO     Unlock all naboo side ships
 ADJJCCAY     Wave pool effect for water levels
 UYCZNCAX     Double secondary weapon
 FJJCUAAC     Cluster seeker missiles