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Carrie Fisher was on smallville last night and one of Lex's plans was numbered 1138. Is that because Carrie was in the episode?

Yes

What's 1138?

It's probably the cell number where Leia was locked in or something.

No, she was locked in 2187 - taken from a favourite short film of George Lucas; it was made by The National Film Board Of Canada.
1138; as in THX-1138 - Lucas debut film?

THX-1138 was Lucas's first movie, very much 1984-esque. THX-1138 was the 'name' of a person in the movie who falls in love which is illegal, and they hunt him down, but he escapes.

All of the Star Wars movies make reference to it.

Yes; in ANH, Luke as a Stormtrooper says Chewbacca is a prison transfer from cell block 1138.

When I played Galacic Battlegrounds, and you click on a stormtrooper, one of the phrases he utters is: "THX-1138 ready, sir."

The Word Wookie was first used in THX-1138... Put the subtitles on "I think it hit a wookie" "go check it out then"