The English dubbing for the movie was not provided by the Hanna-Barbera cast members, but by non-union talent who were contributing at the time to American versions of imported anime.
The theatrical poster for the film boasted, "It's the Smurfs' ONE and ONLY full-length motion picture..ever!" Prior to Flute, however, a black-and-white compilation feature, Les Aventures des Schtroumpfs, was released in Belgium in the mid-1960s, and had been forgotten by the time this film debuted in the US (1983).