- The author of the "Poppins" books, P.L. Travers, approved heartily of the casting of 'Andrews, Julie' after hearing her only on the telephone. Andrews granted the interview from her bed after the delivery of her daughter, Emma Walton.
- Travers was a pill about details in the script, driving many of the Disney writers to distraction about Poppins minutiae. After seeing the final film, she devised a list of changes she wanted. Her requests went unheeded after Walt himself pointed out that although she had SCRIPT approval, she didn't have FINAL DRAFT approval. Among the things that Travers disliked was the Sherman Bros. score. She wanted the only music in the movie to be period pieces such as "Ta Ra Ra Boom De Ay."
- Julie Andrews was left hanging in mid-air during one particularly long camera set up. The stagehands unwittingly lowered her wire harness rather rapidly. "Is she down yet?" called a grip. "You bloody well better believe she is!" fumed Andrews.
- The opening shot of Mary Poppins sitting on a cloud contains a gag originally used in Disney's "Dumbo." While Poppins checks her make-up, her carpetbag slides "through" the cloud. She catches it repeatedly just before it falls to oblivion. The stork delivering Dumbo does the same thing with his bundle.
- The film was shot entirely indoors.
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