The train station of Bridgeton in the movie is really the train station in Glendale, CA.
Sally and her roommates are all doing war work, and on different shifts, which was common during WW2. It was not an easy way to live, but Americans made do. Swing Shift (1984) explored this concept quite well.
The artwork depicted is a fairly accurate representation of what, sadly, would come to be known as the Nazi death camps.
The character portrayed by Richard Arlen states that he is thirty-three years old. Arlen, in 1945, the production year of this movie, was in reality forty-six years old at the time.
Rush Street in Chicago is still a spot for bars, nightclubs, and nefarious characters in 2023.