Although the film is set during the final days of World War II, which ended in 1945, outside the San Francisco hotel where Jeffrey Hunter and Hope Lange spend their honeymoon are parked, among other vehicles, a 1954 Ford and a 1952 Plymouth; CinemaScope panoramas of San Francisco streets, and the San Francisco skyline are all contemporary 1958 views.
The women in this World War 2 story all wear hairdos of the 1950s.
In this story set in WW2 the women all wear hairstyles of the 1950s, and all their clothes are strictly 1958 styles.