Continuity mistake: While Maleficent is in her throne room filled with her henchmen in the Forbidden Mountains, she's wearing her large ring on the index finger of her right hand, but in some shots, that ring is either on her left hand or has vanished altogether. (00:16:00)
Continuity mistake: Anytime the eye colors of the fairies are shown, Fauna's are very obviously brown. However, when the fairies are with Aurora after the curse takes place, a close-up of Fauna holding a handkerchief shows her with blue eyes.
Answer: Because she wasn't paying any attention to the color.
Disney-Freak