When Harry begins to tell the story of how he and Phyllis met and became involved, he starts with, "It was about eight months ago." Since they ended up having a baby, that obviously can't be accurate. First, their child is at least two months old. Then let's not forget the few months they spent apart, intermittently. Considering all of the above, they would have to have been acquainted a year and a half at the very least.
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.