On LVL 14 as human, you receive a quest that you have to kill some bees. But, in order to do that, you have to summon them by clicking on a tree. Once you click on the tree, it does nothing, making the quest ... well, making it useless.
Also, on LVL 9, you have a quest to summon mobs by clicking on a statue. This one doesn't work, too. But, in this case you can kill the mobs going further on the map (the pigs with boomerangs).