Apparently there are quite a few in the show but some are so subtle or so common in animation that they are easily overlooked.
http://37.media.tumblr.com/1a0d3210b...ablto1_400.png - Sayonara Zetsubou Sensei there is also a Gasai Yuno reference from Miria Nikki which probably flew waaaaaaay over my head.
I think people are calling it "ICHIBAN" because it has been something different from the slower(?) shows we had last season,
*edit
Hyouka looks interesting, think I will give it a watch.






