Tori Spelling has already been on the show, way back in the first season when Nina Flowers seemed to ask her about her HIV. https://www.youtube.com/wat…

Elia Kazan's America America would be a good addition to the list. It really makes you appreciate the determination it took for many to get here. It pops up on TCM every now and then (and will be back again on April 26 barring a schedule change).