Contrary to a previous comment, Ann Miller does not dance with Harold Nicholas in the "Mr. Beebe" number. In keeping with the times, the number is all-Black (the better for Southern censors to delete), and all the dancing girls in the number are light-skinned "colored" ladies. This is apparent on DVD.
In the film's plot, Georgia Carroll (playing herself) threatens to leave the Kay Kyser band to marry a servicemember, thereby forcing him to hire a replacement. In real life, after replacing Ginny Simms in Kyser's band, Carroll did indeed get married - to Kay Kyser.
Kay Kyser was 39 when the movie was released. His love interest in the film, played by Ann Miller, was 21. Kyser's actual wife, Georgia Carroll, also in the film, was 25. Kyser and Carroll were married six months before the film was released. They remained married until Kyser's death in 1985.
Final film of Georgia Carroll.
There was a ship named "Rocky Mount" in the U.S. Navy during WW2, but it was not named for Kay Kaiser's hometown in North Carolina. The U.S.S. Rocky Mount (AGC-3) was one of four Appalachian-class command ships that were converted from cargo/transport ships. They were used to command and control amphibious invasions in the Pacific during the war. This ship participated in the landings at the Marshall and Marianas Island, the Philippines and Borneo among others. After the surrender of the Japanese, she monitored the evacuation of Japanese forces from China. The ship was decommissioned in 1947 and scrapped in 1973.