The technically ambitious Naboombu sequence, which combined live action with animated animals in a chaotic soccer match, generated internal friction inside Disney's animation department. Animator Milt Kahl designed the characters but became angered by what he considered inconsistencies in the way they were being animated. The dispute did not become a public Hollywood scandal, but it was serious enough to prompt animation director Ward Kimball to circulate a formal memo dated September 17, 1970, instructing the staff to maintain greater cohesiveness in the characters' design and movement. The sequence required the sodium-vapor compositing process, extensive storyboarding, and months of animation and special-effects work, making continuity problems especially costly. The finished scene was later singled out by critics as the film's technical highlight, even though the internal disagreement revealed how difficult Disney's live-action/animation hybrids had become to control on a shot-by-shot basis.
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