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In page It Happened at the World's Fair:

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The Seattle Center, including the Seattle Center Monorail and the Space Needle, serve as backdrops for several scenes in the film. Security officers pursue Presley and the girl through the fountains at what is now the Pacific Science Center. The hitchhiking scene with Elvis and Gary Lockwood was filmed near Camarillo, California, as were some of the flying scenes. The entire hitchhiking scene to the point where they are both picked up by Kam Tong and Vicky Tiu Cayetano in the truck is easily recognizable as 5th Street near Pleasant Valley Road on the South side of Camarillo.[1]