Originally Posted by Emissary of Justice
Drawing mistake. It's not the first time Kishi's goofed in the manga. In Part 1 of the anime....
That never really made any sense. You're initially required to take the exam alongside your teammates unless there are special circumstances. For Kakashi to wind up teamed with Obito and Rin, they'd have to have graduated the academy together. Therefore, it was retconned away.
That was from a movie and in that same movie, they had itachi and kisame waiting in line for the bathroom. This is just some easter egg shit the people who made it wanted to do.