The movie is about a couple in San Francisco with establishing shots at 1:13 (city landscape) and 1:22 (a city street with a characteristic steep hill). Mr Jordan (Edmund Gwenn) has to travel to LA to do a background check on Harry Graham (Edmond O'Brien). But when he arrives in LA to visit business offices there, the buildings are all on SF style steep streets (see 10:40 and 11:22). They apparently used SF locations for LA locations, and to those who know both cities, it sticks out quite noticeably.