The TV-like machine on which June Havoc is shown performing "The Man with the Big Sombrero" is a "Panoram," a video jukebox that showed short films of popular bands and entertainers during the 1940's. The films shown on it were called "Soundies" and were essentially the music videos of the time.
At the time she made this, Pola Negri (who had been a major star during the silent era) hadn't been on USA screens in a decade because of her work and association with the Nazi film industry in Germany. This film didn't exactly revive her career - after making this, she only appeared in one more film, the 1964 Disney/Haley Mills vehicle The Moon Spinners.
"The Screen Guild Theater" broadcast a 30 minute radio adaptation of the movie on October 4, 1943 with Martha Scott and Dennis O'Keefe reprising their film roles.
June Havoc was Gypsy Rose Lee's sister. June was known in vaudeville as Baby June, accordingv to the movie Gypsy.