Quote Originally Posted by David Craft
ACTUALY the first time Itachi uses that techneque on Kakashi all those years back, it still looks like the regular sharingan (three tomoe's, instead of the shuriken-like-tomoe) too... Which I always thought was kinda strange lol. (Go back and watch it if you dont believe me. ep 82) But hey WHATEVER

Anyways awsome ep ^_^
That was an error on the animator's part.

In the manga, they would show itachi close his eyes, then just as he's about to open them for the mangekyou, they'd cut away....not allowing the viewers to ever actually see the mangekyou sharingan until it was formally introduced in Sasuke's flashback during the Naruto vs Sasuke battle.