During the last skating sequence the ice was dyed black to add drama to the segment. The ice showed skate marks badly so it was covered with a layer of liquid dye to hide the marks. This can be seen by the splashing in fast turns. Near the end the liquid is starting to freeze and skate marks are visible.
Sonja Henie wanted to have three ice skating production numbers, but only two were finished and included in the film. Darryl F. Zanuck would only allow a third if Henie would pay the production costs for it, which she refused.
This film was Sonja Henie's last substantial box-office hit. Her remaining four Hollywood vehicles, Iceland (1942), Wintertime (1943), It's a Pleasure (1945) and The Countess of Monte Cristo (1948), had diminished financial returns. Miss Henie's final feature, the British-made Hello London (1958), was not released in the U.S.
The final production number on black ice took three days to shoot. Near the conclusion, Sonja Henie fell on the ice and was covered with black dye. Director H. Bruce Humberstone and choreographer Hermes Pan asked for another day to finish. Producer Darryl F. Zanuck refused.
Heard twice in the background, "At Last" (music by Harry Warren, lyrics by Mack Gordon) did not receive an on-screen performance, the footage having been cut. In Glenn Miller's follow-up movie, Orchestra Wives (1942), the lush ballad (which became a standard) was sung by Lynn Bari (dubbed by Pat Friday) and Ray Eberle, who were backed by Glenn Miller and His Orchestra featuring Bobby Hackett (playing trumpet for George Montgomery).