Revealing mistake: When Mia meets Asana at her birthday party and asks what she's been up to, Asana replies "oh, partying girl" with a British accent. Then when Asana is talking about Prince Jaques, the accent is gone. Then, at the slumber party, her accent slightly returns.
Revealing mistake: It is quite noticeable that during the party, the "rising star of opera" is lip-synching. Her posture and mouth movements are not like that of an actual opera singer, and there are no visible vibrations of her throat when she sings.
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Suggested correction: The woman playing the Opera Singer in the movie is Anna Netrebko. She is a real opera singer, and she did her own singing for the movie as she was hired specifically to sing in it.
