Personally, if I can understand the sentence despite a grammar/spelling error, it doesn't bother me at all. I took one look at that sentence, quickly thought "I think they meant to type 'rid' here," and then carried on reading the page. Another look shows that this error has now been fixed on the page. That's why the image broke earlier, because the comic was edited and re-uploaded and the old link didn't work. Anyway, my point here is that, unless the spelling/grammar is a consistent issue or severely impacts the quality of the page, it really shouldn't be a big deal.
If I recall correctly, the realms of the underworld and Hell are entirely different places. For those that don't make it into Heaven, I wonder what decides where they will be spending eternity. Which of the sinners are sent to Hell, and which ones are sent to The Land of Tainted Souls? Ghosts are obviously sent to the ghost zone, but that makes one wonder how you become a "ghost." Perhaps you only become a ghost if you have reason to stick around the world of the living after your death, but you don't become a ghost if you immediately proceed to the underworld/Hell after you die. There's also the issue of "living" beings in the underworld, such as Mandy, Him, and Aku. Would killing them really accomplish anything? We've seen with Minnie that dying is more of a hindrance to denizens of the underworld than a permanent end.
Just trying to raise a few discussion points so we have something better to discuss than grammar and hellish worms that are just part of the scenery.