Screenshot from the movie via Petapixel
|Street scene of San Francisco via Shorpy|
Accrording to PetaPixel, the story began over at the vintage photography blog Shorpy, where a member named Ron Yungul submitted a vintage photograph that was captured by his late father on the hills of San Francisco in August, 1957. The photograph was taken by using a Contax camera and Kodachrome film. The Bay Bridge can clearly be seen in the background.
Compare the two shots a little more closely, PetaPixel pointed out that "Yungul’s father must have captured his photograph within minutes of Hitchcock passing by and shooting his."
(Streets of San Francisco: 1957 / Shorpy, via PetaPixel)