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It's not just a function of average bit rate, but also of maximum bit rate.
When something's being fluidly animated, it can't be compressed all that far or you're going to get a significant degradation of video. Animation doesn't compress quite as well as live action in that respect. But when you're NOT talking fluid animation, those scenes take considerably less to animate. (If the screen has Chiyo-chan on it, not moving, occasionally blinking, and the only actual motion is her mouth, it doesn't matter HOW many bits you throw at it... you only need so many!)
A -good- variable bit rate encode will correctly identify those areas which are essentially static and compress them to a lower bitrate, saving up room for those sequences which need as much bitrate as you can give 'em.
Some shows just compress better than others. ;p
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