The Skeleton Demon (based on the Gashadokuro of Japanese folklore) is the largest stop-motion puppet to be built, standing at eighteen feet tall.
The boat sequence took nineteen months to shoot.
At 1 hour and 41 minutes long, this is the longest stop-motion film to date, beating out Coraline (2009) by a minute, which was also from Laika Studios.
Kubo had over 48 million possible facial expressions and a total of 23,187 prototype faces were created for him.
The boat was covered in about a quarter of a million leaves, all placed carefully by hand.