There was some original stuff and some stuff stripped. Mostly faithful though.
Notable stuff (or trivials maybe
):
1. I don't remember the Saori phone conversation, but the adaptation was wrong in a way, since Saori in her Ojou clothes will never use Ninja-speak.
2. A few frames of Dad original scenes.
3. Kirino was supposed to be not feeling too well (though it was not explicitly clear whether she was sick); no mention of throwing away of trophies
4. Cab driver in US is a black hunk.
5. Residence of Kirino different
6. Room layout different
7. No Sis x Sis eroge play in which Kyousuke wanted to choose Rinko's route and some dere reactions from Kirino.
8. Kirino actually uses an iPhone.
9. No Kurara event.
10. As someone mentioned, this is not K-on
11. And finally, Kyousuke's failure in this episode was partially attributed to the cut out monologue.
Despite knowing that this is only about half the intended story of the author, the ending was strangely unsatisfying.