I can see that. A decent rule of thumb might be: if the misinformation would change what players do, then it's probably bad.
E.g. if one villager said the mirror is in the swamp, unlucky players might waste a lot of time in the swamp, which is bad. But saying it's an axe vs a sword vs a piece of armor vs a potion probably doesn't matter much - whatever it is, as long as it is what is required to defeat the dragon, it's fine.
E.g. if one villager said the mirror is in the swamp, unlucky players might waste a lot of time in the swamp, which is bad. But saying it's an axe vs a sword vs a piece of armor vs a potion probably doesn't matter much - whatever it is, as long as it is what is required to defeat the dragon, it's fine.