Good episode. Made me remember some things like why Kabuto keeps Anko alive or Zetsu putting spores on Kabuto. Next time Zabuza (and hopely the Seven Swordmens; wonder if is going to be a filler battle with them) and surely some filler flashback time (aka re-using old episodes).
The episode was great, but too short. I liked the design of how Naruto was trying to perform Bijudama in his Chakra Mode.
Also Tobi was as great and intimidating as ever. I really wish the episodes were longer, but as people have already suggested it seems that when we'll get to main fights against Edo Tensei, we'll see tons of flashbacks and fillers, thus it will prolongue the action and won't make it that short.