when orochimaru confronted kakashi during the prelims, he said that kakashi didnt use to have that eye, so we can assume he didnt get the eye until after oro left.
i think one of kakashi's teammates shoulda been gai.....that wouldve been sweet!
also, here's another detail that i dont think many people would notice without it being brought to their attention
dont those 2 council members look kinda like the 3rds old teammates?