"Give 'Em Hell, Kid" is a song by American alternative band My Chemical Romance from their 2004 album "Three Cheers for Sweet Revenge."
Klaus reads "When sorrows come, they come not single spies, but in battalions." The quote is from William Shakespeare's Hamlet, Act IV, Scene V.
Josh's line "Ain't no party like a cemetery party" may be a reference to a line from Flight of the Conchords (2007), "Ain't no party like my momma's tea party."