In Pablo's house (#79) There is a healer named Tanya who says, "This is a dangerous place around these parts. I'm going to take a good guess and say you could use healed." After you click on her. Obviously the last part is the grammatical error. I do not know if it is meant to be a mistake or not.
If I were you I would change healed to healing btw.
Also in Frog County (#77) Woodman Steve says, "By the way, did you know fish are a vital part of crafting? They fish don't get killed or smooshed into equipment," They fish is the error and I think it is suppose to be The fish. This also may have been on purpose, just seeing if it helps.
EDIT: Robby has fixed these errors (as seen below) so it is no longer relevant.