— Rachel and Kurt somehow had no idea Julliard didn't have a musical theatre program but then immediately become obsessed with whatever random college Emma suggests to them.
— To cheer people up after New Directions became a joke after Finn and Rachel's kiss at Nationals (as if people don't eat that s--t up), Will paints a bunch of pianos purple, puts them all over the school, and tells the club to perform anytime they see one, as if high school students and teachers love nothing more than spontaneous musical numbers.
— Sue runs for Congress on a platform of destroying all arts programs.
— Mercedes reveals that she and Sam broke up, because Sam's dad got a job elsewhere. She's now dating some dude named Shane.
— Will and Emma are now living together.
— Blaine transfers to McKinley to be with Kurt, which is definitely a legitimate reason for adults to let a teenager transfer schools.
— Quinn now has pink hair, a nose ring, and a tattoo of Ryan Seacrest, and she hangs out with a group called "the skanks."
— Will bans Santana from the glee club after she sets a piano on fire.
— Lauren breaks up with Puck because glee club isn't cool anymore.
— Sugar Motta tries out for the glee club after her father donated the pianos, but Will rejects her because she can't sing. Apparently she is the first person to ever audition for the glee club who can't sing.