Other people discovered those workarounds for the hanging imp hero cutscene; I never had any problems there.
Did you get the "rare mushroom" from the little mushroom forest, north west of the village? Try dropping it on the ground, have your hero pick it up, and talk to the mushroom farmer again.
Do you have any other mushrooms in your inventory? You can get a mushroom from a chest in the mushroom forest south of the village, after defeating the mage guarding it. When eaten, it permanently boosts the luck of both your main characters. Dropping or eating this mushroom, if you have it, may help the mushroom farmer recognize the rare mushroom in your inventory.
Does the imp at ask if you have found the mushroom when you talk to him?
