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Originally posted by: DarthAstuart
i have no evidence to back this up, but my feeling is that lucas probably meant to only direct the first one, and when he realized how the new technology made it much smoother for him to direct than the older FX tech used on the first three films, he was able to actually relax and have fun with it, and so pushed on to direct all three.
You're probably on to something here! Good theory DAS!