I'm positive the Afro Vogue segment was planned well ahead just as the other numbers. You have to consider the arrangements, costumes, choreography, Diana's photo segments, etc. all had to be worked on ahead of time so it was ready when they began to film for those 3 days. They filmed more than they could fit into the special. The "I'm The Greatest Star" segment would have been a feature for the girls, but as George and Andy pointed out the tape with the music ran out so there was no way they could complete the number while they were filming it. It was probably decided right there as they were filming it that it couldn't be used.
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