Continuity mistake: Aurora's crown has no jewels, but when she collapses jewels suddenly appear on it.
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.
Continuity mistake: When Merryweather makes the dress blue a second time, it starts off on a ribbon that wraps itself around the dress waistline. The ribbon doesn't make it onto the completed dress.
Suggested correction: Hardly a mistake, since they're using magic and the dress changes multiple times.