Before shooting began in November, Hitchcock dispatched assistant director Hilton A. Green to Phoenix to scout locations and shoot the opening scene. The shot was supposed to be an aerial shot of Phoenix that slowly zoomed into the hotel window of a passionate Marion and Sam. Ultimately, the helicopter footage proved too shaky and had to be spliced with footage from the studio. Another crew filmed day and night footage on Highway 99 between Gorman and Fresno, California for projection when Marion drives from Phoenix. Footage of her driving into Bakersfield to trade her car is also shown. They also provided the location shots for the scene in which she is discovered sleeping in her car by the highway patrolman. In one street scene shot in downtown Phoenix, Christmas decorations were discovered to be visible; rather than re-shoot the footage, Hitchcock chose to add a graphic to the opening scene marking the date as "Friday, December the Eleventh".