Anne Hathaway was hired for the role of Mia because Gary Marshall's granddaughters saw her audition tape and said she had the best "princess hair.
Jessica Biel reportedly turned down the role of Mia.
Several actors and actresses have worked on one of or both of the Princess Diaries movies and Pretty Woman (in roles both in front of and behind the cameras): Hector Elizondo, Judith Baldwin, Julie Paris, Harvey Keenan, Scott Marshall*, Kathleen Marshall*, Don Feldstein, Patrick Richwood, Marvin Braverman, Jeff Michalski, Steve Restivo, Larry Miller, Allan Kent, Tracy Reiner*, Mychael Bates, and Charles Minsky. *Note the last name of these people.
The piece of writing Mia recites when practicing speeches is part of one of Juliet's soliloquy's from Romeo and Juliet.
Cinderella reference: Mia is late (for meeting with her grandmother) and is running across the lawn when she loses a shoe.
There were four different cats used to play the role of Fat Louie. One who allowed people to carry it, one who could sit still, another who would jump and the last one who sits on the envelope at the end of the movie.
Mia's cat, Fat Louie, was Anne Hathaway's pet in real life.
Anne Hathaway's movie debut.
# # In the book, Mia's father is not dead. Rather he has testicular cancer. In order to avoid what Disney thought was a too adult topic, he was just written as dead in the movie. In the book, when Mia shoves the ice cream on Lana, her father sticks up for her with her mother. Also in the book, the plot of Mia's mother Helen dating her math teacher is a much bigger deal.
During auditions, Anne Hathaway fell out of her chair, and was immediately given the part as clumsy Mia Thermopolis.
# # During shooting of tea scene in the garden and the greenhouse scene, airplanes were flying over the area and interfered with the sound. When the scenes were finished, the director gave Anne Hathaway and Julie Andrews awards for "best acting in airplane interference".
While filming the final celebratory dance scene, the Madonna song "Like A Prayer" was played on a boom-box to elicit natural dancing from the actors on set (to be then dubbed over by the song that appears in the film's final cut). The assistant director had to do multiple takes of this scene because the actors kept mouthing the words to "Like A Prayer" while on camera.
The trolley that Mia rolls back into with her mustang is not a trolley or cable car but a tour bus. The tires of the bus can be seen in the shot.
The egg chef in the kitchen during the rain sequence towards the end of the movie is young actor/producer Anthony Begonia.
It was Anne Hathaway's idea to have the pore strip on her nose.
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