The game includes 160 playable characters.
If you watch the Lego Indiana Jones trailer in the special area you will unlock him as a playable character.
If you're playing with Lando Calrissian and try to hit Princess Leia, he will instead kiss her hand, much to her disgust.
WILHELM SCREAM: During the first battle of Star Wars episode 3, when you are killed.
Second time being able to play as a ghost in any lego video game. First time being in LEGO Star Wars 2: The Original Trilogy