Found two (maybe three) so far, and they are pretty bad bugs too.
1. Occulus level 15 chain lightning perk doesn't work. It's supposed to stop opponent regen for both mana and health, yet they are clearly able to regen just fine. Until this is fixed, it's only a wasted point.
2. When those little lightning balls are summoned, if you have all the minions selected along with Occulus, he inexplicably slows down to a crawl, regardless of his move speed. This is VERY bad if you are trying to get away.
(Possibly 3). The minion enhancement skill that is supposed to allow them a chance to do extra lightning damage doesn't seem to work at all, not that I can tell anyway. It would be nice if there was a way to tell that it activated, like little blue damage numbers or something. So far, it seems to be broken as well.