Director Rob Marshall said that the role of Magic Nanny Mary Poppins needs a staid and conservative appearance, but underneath her appearance, she needs a lot of warmth and humor. Emily Blunt possesses these qualities and depth, and is a very good actor. Not only that, she also can sing and dance, and she is also British, so she can understand this role. Rob Marshall said that he knew Emily Blunt was the best candidate from the bottom of his heart, and he hadn't considered other people at all
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Lin-Manuel Miranda won the 2016 Grammy Award for Best Musical for the musical " Hamilton " starring, screenwriter and original lyrics . Lin-Manuel Miranda, a composer, singer, actor, and screenwriter, has also participated in the creation of the soundtrack for "Star Wars: The Force Awakens", and Disney's 2016 animated film "Pocahontas" was also scored by him. Lin-Manuel Miranda has won Tony Awards, Grammys, and Emmy Awards. He played a lamplighter named Jack in the film. The role of this role is similar to the chimney sweeper played by Dick van Dyck in the original version, and has many rivals with the magic nanny Mary Poppins
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