Sally Rand, before becoming notorious for her "fan dance" at the 1933 World's Fair, was an extra in the film.I couldn't find a YouTube clip of Ayn Rand in "King of Kings," but I did find Sally Rand and her notorious World's Fair fan dance:
Ayn Rand (no relation to Sally Rand) also was an extra in the film, and met her future husband Frank O'Connor on set.
I also found this 2009 New Yorker article about Ayn Rand that covers the "King of Kings" phase:
Rand... left the U.S.S.R. for America.... Her vision of the U.S. had already been shaped by obsessive moviegoing.... Even before leaving the Soviet Union, she had published a pamphlet on the silent-film actress Pola Negri, and like a movie star herself she now refashioned “Rosenbaum” into her own new name. Heller and Burns both knock down the myth that a Remington-Rand typewriter inspired the rechristening.How do you feel about all those connections? The Soviet Union, the love of movies, immigration to the land of movies, name-changing, finding the love of your life on a movie set in Hollywood, strippers performing what is only the illusion of nakedness, and... Jesus.
There is a greater factual basis to the legend of Rand’s having met Cecil B. DeMille before she worked as an extra on his production of “The King of Kings” (1927). On the set, Rand persuaded a costume director to promote her from a crowd of beggars to a crowd of patricians, and DeMille had his story chief look at her film scenarios, which were soon judged over the top. Rand achieved steadier success working in the R.K.O. wardrobe department, and then had a writerly breakthrough with a courtroom murder drama called “Night of January 16th.” Thanks to a gimmick that allowed each night’s audience to serve as the jury and thereby choose the ending, the play made it to Broadway, where Rand railed against the producers’ subordination of its incidental messages about the beauty of unbridled individualism.
Settling in New York with her husband, Frank O’Connor (another “King of Kings” extra), Rand set seriously to work on the first of her two major novels, “The Fountainhead.”....