Snipped from "Return of the Jedi"

Obi-Wan: The other he spoke of was E. T.

Luke: E. T.?!?

Obi-Wan: Yes, Luke. E. T.: the Extra-Tasty Terrestrial.

Cut from "The Phantom Menace"

Jar Jar: Egads! What is mesa sayin?

Threepio: I am fluent in over 6 million forms of communications...and I was just asking myself that same question.

Dropped from "The Empire Strikes Back"

Imperial officer: Captain Needa, the ship no longer appears on our Scopes.

Needa: Then try Listerene.

Erased from "Attack of the Clones"

Padme: I'm a real person in the real world.

Whoops, sorry, for some reason they kept that in.

Deleted from "Revenge of the Sith"

Mace: The Sith always walk single file to hide their numbers.

Yoda: Confusing the Sith with Tusken Raiders, you are.

Banished from "A New Hope"

Beru: Luke! Luke!

Luke: Yes, Aunt Beru.

Beru: Tell Uncle if he buys soda make sure it's Pepsi!