Harriet Hilliard
I'm was reading Ozzie Nelson's autobiography and according to him; Irene Dunne was originally going to play the part that Harriet played in this movie. Harriet had done a screen test in Hollywood the year before. But she didn't get the part. While the director; Mark Sandrich was looking for a replacement; he happened to see her screen test and called Harriet's agent to offer her the part.
Harriet was actually in Hollywood at the time for only six weeks to do a minor part in another movie and turned the part in "Follow the Fleet" down. She and Ozzie had just recently gotten married and she knew that if she accepted the part; they would be apart longer. Ozzie was in New York, his orchestra playing in clubs and on a regular weekly radio show on Sunday evenings. Ozzie thought that this would be great for her career so he told her to take the part.
Ozzie also said that Harriet and Ginger Rogers became great friends during the movie and that Mark Sandrich use to refer to them as "Topsy & Eva".