The strategy was highly effective, particularly when filming on location, such as in the redwood forests near Crescent City, California (used for Endor), and the Buttercup Valley in Arizona (used for Jabba the Hutt's sail barge scenes).
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The ruse was so successful that it worked until the actors playing Han, Luke, and Leia arrived on set, at which point it became obvious to bystanders that this was not a low-budget horror film, but the next Star Wars film.
The "Blue Harvest" moniker was a clever, "horror beyond imagination" prank that allowed one of the biggest film franchises in history to shoot under the radar.
