Fred Astaire was borrowed from Metro-Goldwyn-Mayer for this film, as Paramount had no star dancers under contract.
As this film was conceived as a star vehicle for the female lead, there are fewer Astaire numbers than one expects from one of his musicals, and only one solo: the celebrated "Piano Dance," in which he jaunts on, in, above and under a grand piano, culminating in a series of effortless suspensions over a succession of high-back chairs.
Composer-lyricist Frank Loesser was an old hand at writing specialty material for Betty Hutton, which required songs that could be performed at her signature breakneck speed. For this occasion, Loesser provided the especially manic "Can't Stop Talking About Him," which opens the film. In a send-up of Hutton's clarion belt, the song begins with an air raid siren that merges into a sustained note from Hutton.
Owing to the film's unusually heavy plotting, Let's Dance (1950), at 112 minutes, has one of the longest running times of Betty Hutton's star vehicles (only Incendiary Blonde (1945) runs longer). Similarly, only three of Astaire's musicals run as long or longer: The Band Wagon (1953), Daddy Long Legs (1955) and Silk Stockings (1957).
One of only seven films Betty Hutton made in Technicolor. The others are Happy Go Lucky (1943), Incendiary Blonde (1945), The Perils of Pauline (1947), Annie Get Your Gun (1950), The Greatest Show on Earth (1952) and Somebody Loves Me (1952).