TML said:

Correct me if I'm wrong (I'm just going off of a Youtube video I watched), but the infamous "Wilhelm Scream" is present in The Empire Strikes Back, but it's barely audible (When Chewbacca throws the Storm Trooper off the ledge at the Bespin Freezing Chamber). This is just a fun little suggestion, but it would be nice to have the scream louder so you can actually hear it or insert it into a different scene. (Hoth maybe?)

Ah, hello there. Long time lurker, first time poster, well almost at least.

The Wilhelm scream IS actually in the Hoth battle, when that "radar-laser" cannon gets fried in the beginning of the battle.

About 16 seconds in: http://www.youtube.com/watch?v=JhpS69eAXrU

Cheers