Kurt tells Sebastian that he doesn't like him or his CW hair. Grant Gustin would later go on to play Campbell Price on 90210 (2008) and Barry Allen on The Flash (2014), both of which are CW shows.
Quinn tells Rachel in this episode that she's an adult and can do what she wants. But later in this episode goes to say that she's 17.
The song, "We Are Young" was given to Glee music supervisors by John Janick "about five months" before its release by the group "fun". When Janick suggested that the track was perfect for the musical show, Bloom demurred. "Glee doesn't break bands, we celebrate existing pop success that's our core model." Bloom changed his mind after playing the song only once and less than five minutes later sent it to Glee co-creator Ryan Murphy. Bloom called the cover of "We Are Young" one of "the pinnacle song moments of the entire series. The Glee cast version topped the Digital Songs chart in December 2011, hitting number one on iTunes and number 12 on the Billboard Hot 100.
New Directions does a trio of Jackson songs, From ABC by The Jackson 5, to Control by Janet Jackson, to Man in the Mirror by Michael Jackson.
After Kurt tells Sebastian that he doesn't like him Sebastian calls Blaine "Killer" Darren Criss who played Blaine would later play Andrew Cunanan the killer of Gianni Versaci in The Assassination of Gianni Versaci: American Crime Story.