I particularly loved the giant witch who flew across the stage, jaw moving; but the forest itself was my favorite. Cutout branches layered on cutout branches, to give a sense of depth and baroque complexity. The forest set is in use for a large part of the opera, though it is notably absent once the witch's cottage appears. The moving ferris wheel, spoked with gingerbread people, out behind the cottage was brilliant; and there was also a fishmobile which didn't seem to have any plot purpose but was wicked cool.
I was almost too tired to make it to the Academy of Music in the first place; I'm glad I did.