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The puppets used neither of the industry standards of replaceable heads (like those used on The Nightmare Before Christmas (1993)) or replaceable mouths (like those used by Aardman Studios in Wallace & Gromit in The Curse of the Were-Rabbit (2005)) but instead used precision crafted clockwork heads, adjusted by hidden keys. This allowed for unprecedented subtlety, but was apparently even more painstaking than the already notoriously arduous animation. One animator even reported having recurring nightmares of adjusting his own facial expression in this fashion.
