Star Wars the Force Unleashed Easter Egg - THX References

In the Level on board the StarShip Emperical Starkiller is referred to over the PA as "Subject 1138"
Also, in the Cloud City level in the last area where you fight the shadow guard on one of the landing platforms is an insect looking spaceship, this is later identified in the database as the "THX-1138"

both of these of course are references to George Lucas' 1971 film 'THX-1138'