"If the animators could hide something so secretly that I could watch it numerous times, both on the computer and on the screen, and not pick up on it, then it deserves to be in the movie. But if they had more overt things, I'd often tell them to cut it out. In general, as long as they captured the spirit of the character, then they're fine. But sometimes it took a while, and we had to replace a lot of animators."