I was watching and the episode before it is when the king of Synthos , Gareth, gets returned to his rightful place as king -- and I've always thought that the name Gareth was sort of an homage to Jareth from Labyrinth, with him being British and of course the whole rock and roll (think Ziggy Startdust) look and mentality...
Then I see this episode and I couldn't have been happier to see it -- they nailed so many references, to finding Ludo, and the bog of eternal stench; they of course couldn't use the exact music, but even the theme music was so very close to the original that it left no doubt in my mind.
Anyway, I had to race here to confirm it, and shout my praises <3.