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), Fleur d'hiver (1943), La fée blanche (1945), and La comtesse de Monte-Cristo (1948), had diminished financial returns. Henie's final feature, the British-made Hello London (1958), was not released in the U.S.
When this film was starting production, Sonja Henie's contract with 20th Century-Fox was about to expire, and studio head Darryl F. Zanuck, who loathed contract negotiations with the savvy and self-confident skater, couldn't wait to see her depart Fox. But this film proved to be a huge box office hit, and the Fox board of directors insisted Henie sign for a minimum of two more movies. Both of Henie's follow-up films, Iceland (1942) and Fleur d'hiver (1943), were box office failures, and Zanuck and Henie finally parted ways in 1943.
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, Kalamazoo (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).