Musically, this episode doesn't give anything to the New Directions, which is pretty unusual. Mercedes gets the aforementioned number, which strangely enough, she does with Cheerio backing, even though her fellow glee club members are nearby. Granted, the entire thing is in her head, but still... Why would she choose the popular kids that don't like her rather than her supportive friends?
Vocal Adrenaline also returns with "Mercy," apparently a piece just meant to show that Dakota is a ruthless dictator with his choreography. It looks impressive, but without any characters to care about in the group, that's all it is.
The rest of the numbers are performed by Acafellas, which originally consists of Will, Ken (Patrick Gallagher), Howard (Kent Avenido), and Henri (Tony Award Winning Broadway star John Lloyd Young). Strangely, and regrettably, Henri is only in this one episode, and does not get to be featured heavily singing. Another missed opportunity, like Garber and Monk. This first group sings "This Is How We Do It" and "Poison," as well as "For He's a Jolly Good Fellow" with Sandy.
Then Howard and Henri quit, and Finn and Puck (Mark Salling) join, as does Sandy, and the group does "I Wanna Sex You Up." All the Acafellas songs sound great, but they are only there to let Will taste a bit of his dream, not for any larger plot point. As such, the music in this episode, while well done, is less moving than in most episodes. After all, none of these pieces even make the Volume One soundtrack, save Mercedes's number.
In what has become a regular part of these season one reviews, random continuity notes:
Brittany (Heather Morris) is sometimes shown hanging out with Quinn and Santana (Naya Rivera), but mostly is left out, and it even missing from at least one New Directions group scene. Funnily enough, Morris is paired with Rivera in the opening credits. At least Brittany is featured dancing in "Bust Your Windows."
Windshields do not bust in the manner in which Kurt's does. They are comprised of two sheets of glass with an adhesive bit in the middle. It takes a lot to put a hole in it, and it would develop long cracks, too. It appears to be tempered glass, which is generally used in the side windows. I actually found usefull, applicable knowledge from my sixteen months of handling auto insurance glass claims!