When Prince Phillip is caught in the thorns, Merryweather uses her magic to untangle him. A split second after she has freed him, Flora and Fauna arrive and use their magic on the branch, even though he is uncaught.
When Flora, Fauna, and Merryweather are flying quickly back to the cottage, they are glowing in their respective colors (red, green, and blue). However in a close-up, Flora is glowing green, while Fauna is glowing red.
The tiara given to Aurora by the three fairies has no jewels, but later on, when Maleficent shows the fallen figure of Aurora to the fairies, the tiara has rubies in it. They disappear when Prince Phillip and Aurora are descending the stairwell before they start waltzing.
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.
After the good fairies place the sleeping Aurora on the castle tower's bed, we see the bed draped in a dark blue and royal blue coverlet with golden tree branches. But just before Flora closes the drapes, the coverlet has changed to a solid royal blue.
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).
Everyone knows that the curse was due to be cast by sunset on Aurora's 16th birthday, so why didn't the fairies just wait an extra day? They also could have transformed Aurora into a shrubbery or something on the last day just to be extra cautious. The dusk walk back to the castle was especially conspicuous.
The three fairies have been living with Aurora in the cottage for 16 years, seemingly self-sufficient. But in all this time, Flora has NO idea how to sew, and Fauna can't even follow simple directions for a cake?
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's 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.