They kept Kyon's monologues, THANK YOU GOD (KYOANI)!!
On top of that, they even kept that unique thing where the Haruhi would reply to Kyon's comments/tsukkomis even though he didn't actually say them out loud (many of the off screen lines from Kyon were not spoken lines).
Oh, and the appearance of CompAce and Comptiq... I have both of those issues and it cracked me up.
The "3 weird things about Haruhi" section was brilliantly done too, I really loved how they handled the hairstyle part. ^^
The episode ended with the announcement of the creation of SOS-dan, which is a good place to cut off.
Oh, for the next episode preview:
Mikuru-chan's first sacrifice for SOS-dan, just thinking about it now is making me laugh. Goto Yuuko's voice is too incredible