Agron and Jayma Mays, who continued to appear as guidance counselor Emma Pillsbury, were credited as guest stars this season rather than as series regulars.
This season marked the final appearance of Cory Monteith on the show before his death on July 13, 2013.
Time to get groovy with another tribute episode, this one celebrating one of the more influential genres.
Matthew Hodgson is a staff writer on the television show Glee.
Before becoming a staff writer, he had worked as a script supervisor for the show.
Sure enough, Blaine, Brittany, and Mike - the dancers of the show who can currently dance - perform what else but "You Should Be Dancing".
Afterwards, when Will asks them why, they say it's because they just found out that the Nationals theme is "vintage".