"South Park" released an episode with the same title two years prior to this Simpsons episode. Both titles parody the then-popular Disney franchise, "High School Musical".
Both this episode and "How I Spent My Strummer Vacation" involve a member of the Simpson family going to a music related camp in "How I Spent My Strummer Vacation" it was Homer going to Rock and Roll fantasy camp and in this episode it is Lisa who goes to performing arts camp.
The ages of two characters are revealed: Dewey Largo (music teacher at Springfield Elementary) - 53 years old Maggie - 1 year old
Jemaine Clement and Bret McKenzie (who play Ethan and Kurt, respectively) also star in a band and a show called Flight of the Conchords (2007)
The sound of a Concord is played when the the guest stars fly... a nod to the name of their real life band.