That's Entertainment, Part II together for the first time since the 1946 film "Ziegfeld Follies", and for only the second time in their careers. (It was the last time 76-year-old Astaire danced on film, though the veteran actor continued to make film and TV appearances into the 1980s; Kelly would go on to appear in the 1980 musical "Xanadu".) According to film historian Robert Osborne, in specially-filmed introductions produced for Turner Classic Movies, it was Astaire who suggested to Kelly that the two take advantage of this potentially last-in-a-lifetime opportunity to perform together, something Kelly actually wishes for out loud during his narration of
Swing Time (film) dialogue. Astaire spent almost eight weeks preparing for the film's dance numbers. The "Bojangles of Harlem" number, a tribute to Bill "Bojangles" Robinson, was the last part of the film shot, because of the special effects required. To create the effect that Astaire was dancing with three shadows of himself that were larger-than-life, Astaire had to be filmed dancing in front of a blank white screen on which a powerful light projected his shadow. This footage was tripled in the film lab. Astaire was next filmed performing under normal lighting in front of another white screen while watching a projection