Mr. Shuester
Episode 8 of glee season one, titled "Mash-up" includes the songs: "Bust a Move" "The Thong Song" "Sweet Caroline" "I Could Have Danced All Night" "Bust a Move", "The Thong Song", and "Sweet Caroline" were released as singles on iTunes.
episode 3 "Acafellas"
Young MC also remixed in FOX's Glee
Funk
There is no episode on Glee that is named "You Do". However, there is an episode on Glee that is "I Do". S04E14
episode 20
Rachel never dies in Glee.
A Glee "ENCORE" episode generally means it is a repeated episode (being replayed due to popularity)
The Glee tribute episode is not actually a tribute to anyone.
Glee season 2 episode 16- Original Song
Episode 3 of Glee is titled 'Acafellas'.