Dean talks with “Hamilton” creator Lin Manuel Miranda about his new project, “Mary Poppins Returns”

Actress Lin-Manuel Miranda attends a special screening of Disney's "Mary Poppins Returns", hosted by The Cinema Society, at the SVA Theatre on Monday, Dec. 17, 2018, in New York. (Photo by Evan Agostini/Invision/AP)

Dean interviews Lin Manuel Miranda on his new film, Mary Poppins Returns.

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