Unlock Extra Characters - When you start the game you are in the Mos Eisley Cantina. Go to the bar and you will be able to select "ENTER CODE". Enter the following codes to unlock some extras.

Password Effect

HHY697 Boss Nass
QRN714 Captain Tarpals
DDD748 Count Dooku
EUK421 Darth Maul
BRJ437 Disguise
AAB123 Droid Tri-Fighter
EWK785 Ewok
CLZ738 Force Grapple Leap
PMN576 General Grevious
ZZR636 Greedo
HUT845 Imperial Shuttle
EVILR2 r2-q5 droid
INT729 Tie Interceptor
NBN431 Unlock Stormtrooper
GIJ989 Unlocks IG88
KLJ897 Unlocks Jango Fett
BDC866 Unlocks Vulture Droid
PLL967 Watto
584HJF Zam Wesell
UUU875 Zam's Speeder

Unlockables

Indiana Jones - There is one more character avaliable in the store, but you cannot unlock him by just playing the game.

Indiana Jones Go into the "Bonus Room" in the Cantina, and go to the Trailers door. Watch "Lego Indiana Jones" and Indiana Jones is now available to purchase