I just found this, and I REALLY wanna watch the 1st gen Back to the Idoling episodes, but if I remember correctly they didn't include it in the 1st season DVD box. Any ideas where to find these eps?
Back to the Idoling!!! segment
You can find Rumi, Ruri, Maipuru, Tonooka, and Fonchi parts on Season 2 disc 1.
I don't know about the others. Maybe in Season 3.