The auditioning process for "Barbie" was a complicated one. The production managed to keep the details of the movie out of the public eye; that's no small feat for a production of its size, but one that was necessary for the film's marketing campaign. The mystique of the project was a massive selling point, and the first trailer for "Barbie" showed only a brief montage of clips from the actual film, filling the bulk of its runtime with a parody of Stanley Kubrick's "2001: A Space Odyssey" in which Margot Robbie's Barbie towered over a barren landscape of girls playing with other dolls.

As a result of that tight-lipped approach, Allison Jones and Lucy Bevan told The Credits that most actors who auditioned for "Barbie" went in unaware of what they were auditioning for. "We weren't allowed to send the script to anybody," Jones said. "So people did a lot of it on faith." But for the actors who sent in their self-tapes, they had a good reason to be excited about the opportunity. "Everybody wanted to work with [director] Greta [Gerwig], for good reason," Jones added.