none said:

Tobar wrote: The interior of the cave was shot at ILM on their stage.

Nice this adds some credibility to my cereal theory. Never realized movie theaters were such sticklers for having the movie play on the half hour that they would eliminate a whole showing instead of shifting times by 5-10 minutes...

Not really. In the cut scene 3P0 was clearly shot outside against a real background, while the commercial is clearly a set. Also the cave entrance in the commercial is a different shape altogether.