I always have trouble explaining the Slippery Rock thing to guests attending a Michigan game for the first time, probably because I didn't know many details myself, so it was nice to see it spelled out for me.
That being said, I was puzzled by this tidbit:
For a time, announcing the Slippery Rock score lapsed, partly because of a technological period during which wires had ceased to exist but the Internet had not yet evolved to a place where scores of obscure Division II football games were instantly accessible. Dave Brandon, the Michigan athletic director from 2010 to 2014, remembered the tradition from his days as a player (for Michigan, not Slippery Rock) and brought it back several years ago.
Does anyone remember a stretch when Slippery Rock scores were not being announced? I was attending a game or two a year in leadup to the Brandon era and don't remember a gap, but might not have noticed.
insert mandatory grumble grumble Dave Brandon grumble grumble here