Continuity mistake: The colour and position of the teapots on the Mad Hatter's table is an absolute chaos: First they're pink, yellow and white, then in the close-up green and blue teapots appear. When Alice stands by the head of the table the colours change again and they stop moving despite the music still sounding.
Continuity mistake: When Alice becomes a giant a wide shot of the garden shows the main entrance's broken door leaning on her left foot. First of all, the rabbit managed to open it before she burst it with her right foot. Second of all, when she shrinks, the door appears magically back in its place. And no, it's not a different door because at 00:21:05 we see the house and there is no door where her left foot later comes out through.
Continuity mistake: When Alice eats the cookie in the rabbit's place her foot grows huge along the stairs, down to the entrance and out to the garden without knocking a single object except the poor rabbit. When the angle changes to a shot outside the house suddenly all of the furniture has magically appeared out of nowhere next to the shoe.