Plot hole: During the scene where Merida gives her speech on "breaking tradition", her mother, as a bear, moves silently behind the majority of the crowd, so they don't see her. Fair enough. However, Merida and her father's clan are all looking in the same general direction (towards the crowd) while she's speaking - how does no one from Merida's clan see a bear moving at the back of the room?
Continuity mistake: When Merida and Eleanor (bear form) wake up after spending the night at the witch's exploded cottage, she wakes up with a different dress on and has a bow and arrows in her keep. But when they leave the castle she is still in a tattered dress and isn't carrying anything. She could have grabbed a bow and arrows from an armory outside but I can't for the life of me figure out where she got the dress.
Continuity mistake: After Mor'du gets crushed by a large piece of stone, and as the sun is rising, Merida removed the tapestry from Angus to place over her mother, who is still a bear, in hope to break the spell. Angus also appears to be in the circle of stones, yet, in the shot that views everyone in the circle of stones from above, Angus is nowhere in sight.