This thread makes me think natural selection is on vacation. Sorry if that's harsh, but did the OP even CHECK the speed of lightning?
The Haku thing is bull I believe, it was only demonstrated in the English dub.
As for the Kakashi thing:
1. lightning does not move at lightspeed
2. we never actually saw it happen, only based on rumour
3. it could have been a lightning-based technique, not real lightning.