Hmm, they changed one thing which I thought was somewhat significant.
Spoiler for compared to the manga:
In the manga chapter (#28), Haruhi is looking at the pots from that fake seller, and he rudely tells her to get lost - and Kyouya notices that. Then the "oku-sama" turns up and it's the same from that point on. Basically, there's a subtle hint that Kyouya might have wanted to get revenge on the guy for being rude to Haruhi.
Also, in the manga, the thing with the melon snacks came first...
and, at the end of the manga, Kyouya uses his secret police to tie up the other members at the department and leaves them there
Still, nice episode.