Ah, but if you remember, hasn't Ibiki said there were only 2 chuunins placed in exam, and didn't they show faces of those 2 chuunins... And the old man wasn't one of them ^^Ah, but if you remember, hadn't they placed Chuunin/Jounin into that exam that had already passed it, who knew the answers to the paper, in order to encourage the cheating? He may have just been one of the people there that the Genin didn't spot until it was pointed out.
It would have fooled Naruto....Ah, but if you remember, hasn't Ibiki said there were only 2 chuunins placed in exam, and didn't they show faces of those 2 chuunins... And the old man wasn't one of them ^^