Revealing mistake: As Elsa sings "Let It Go" she pulls her hair into a long braid going down her back. She pulls it with her left hand from behind her to in front, but the end doesn't flip over her shoulder, she just pulls it straight through to the other side without going over the top. (00:34:10)
Continuity mistake: When Nick is telling the doctor about his new cottage near the start, he goes to his porch with a book and stands next to one of the pillars. In a wide angle, he is standing next to a pillar with leaves around the pillar, but in a sudden close-up the leaves around the pillar have vanished. (00:04:40)