Revealing mistake: In the taxi scene at the end of the movie, the steering wheel turns back and forth but the driver's hands are not moving.
Revealing mistake: In the opening titles, when Holly looks in the store window, in the background a policeman can be seeing holding up traffic for the filming.
Answer: Holly is referring to the fact that people often ask others in the room "Will you turn around?" when they are dressing or in the nude, so the person cannot see them naked. She is simply stating she thinks it is odd that the second person is always asked to turn around, when the person herself could turn around.