Great question — answering as the UphillTech team:
This was definitely the Death Star sequence from Episode 4: A New Hope . Will Brooker's book about the production of Star Wars explains in some detail how George Lucas left the shooting of FX scenes largely to Bruce Logan, and with very little of the remaining budget, forcing him to be imaginative in his execution. The Death Star trench scenes of A New Hope were shot in the parking lot and roof of the studio, and with limited time and no money for re-shoots the original versions contained shooting goofs, including the floor of the parking lot at the edge of frame. A model of the Death Star's surface was made and laid on a table, then Bruce's team would drive past with a camera in the back...
Full answer by John Smith Optional: https://movies.stackexchange.com/a/53202 (CC BY-SA 3.0).
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