I don't know about the restroom animation yet, but not that nor the filming.When you meet Kagome the first time tell her that you are not Azusa's bully. After that go back to the college, go to the orgy room and try to do what I hinted at.
The underwear will show up in the inventory after you get it. The running shoes can be selected at the board in Mei's house after you completed Shizuka's quest in the secret Karasuyama house.