Continuity mistake: When the dwarves see their table in the beginning, some of the dinner utensils are blue. But later, when the dwarves run down for dinner, none of them are blue, they're all white.
Continuity mistake: There are six doves sitting on the wishing well in the start, but at least eight different ones are seen flying away when the prince comes.
Continuity mistake: When the queen comes down to her secret lab to transform herself and to make the poisoned apple, we see a crow perched on a skull. Throughout the scenes in the lab, the skull sometimes has an opening on the top and sometimes doesn't.
Continuity mistake: The cobwebs on the broom change between the two shots of it leaning in the corner.