The actors Katja Herbers and Ashley Zukerman, playing Helen and Charlie, are really a couple. They fell in love on set.
The show lasts 2 seasons and takes place from July 1943 - 1945 sans some flashbacks.
For the director/producer 'Thomas Schlamme', the visual pattern for the show when shooting the pilot is influenced by Robert Altman's McCabe & Mrs. Miller (1971).