Deliberate mistake: In the hotel bar at night, when Edward is playing the piano and Vivian goes to find him, after Edward has dismissed everyone else from the room Vivian sits on top of the piano and puts her feet on the keyboard. Her feet go onto the keys in the middle of the keyboard but the sound that comes out is from the bottom and the top notes of the piano.

Pretty Woman (1990)
1 deliberate mistake
Directed by: Garry Marshall
Starring: Amy Yasbeck, Hector Elizondo, Jason Alexander, Julia Roberts, Laura San Giacomo, Ralph Bellamy, Richard Gere
Continuity mistake: During the scene where Vivian is with Edward at the hotel room, they're talking while he's inside sitting and she's outside. You can see on the first shot it's day time and when Edward stands up and goes near her it's evening time already. (or viceversa)
Edward: You can't charge me for directions.
Vivian: I can do anything I want, baby. I ain't lost.
Trivia: Richard Gere actually plays the piano - and he composed this piece himself.
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Answer: As the other answer indicated, it was part of her cheap hooker persona, but it also makes a greater impact on the audience when they see Vivian undergo her "transformation" with the classy designer clothes, toned-down make-up, and her own nicely-styled hair.
raywest