During his revelation of the living palace he has had built for Aurora and Phillip, King Hubert places a bottle of wine at the end of the buffet table behind an elevated bowl of food, but when he and King Stefan proceed to the center to share a laugh, they separate to reveal that the bottle has disappeared from the end of the table to the center.
The opening credits list the late 17th-century Charles Perrault version of Sleeping Beauty (La Belle au bois dormant/Beauty sleeping in the woods) as the basis of the film. However, the film is much closer to the early 19th-century Brothers Grimm (Jacob Grimm und Wilhelm Grimm) version of the same story: Dornröschen (Little Briar Rose).
When Flora and Merryweather are changing each other into blue and pink, respectively, with their wands, they forget to block the chimney. When Diablo the raven arrives, he looks down the chimney, out of which pink and blue magical streams are shooting. He gets hit with both colors; however, he does not change from his natural black color.
The goof item below may give away important plot points.
After Maleficent transforms into the dragon, we see Prince Phillip charge at her at full speed. When he his knocked off his horse, Sampson, he charges towards Maleficent and disappears. Seconds later Maleficent destroys the bridge, and somehow Sampson is back in the thorn bushes.