The film continued the Xerox method of photocopying drawings onto animation cels used in "101 Dalmatians". An additional animation technique, "touch-up", was created during production. The animation process had previously involved the use of clean-ups where assistant animators transferred the directing animators' sketches by hand onto a new sheet of paper, which were later copied to an animation cel. Clean-ups was replaced by touch-ups, where the assistants drew directly on the animators' sketches before the drawing was copied onto a cel. This made assistants of the demanding animator Kahl often fear they'd ruin his linework.