Has anyone else noticed that the tagline for the spot is wrong? it should be "He-Who-Must-Not-Be-Named." not "shall" not. it's been bugging me, does anyone know how to change it?

I noticed it too, the fact it's in inverted comma's is a bit annoying to me, but hey, live and let live.
The only way bạn can change it is to find the person who made this spot and ask them. Good luck, with 49'568 fans, you're gonna need it.