Bug: In the quest to "Find Kiki the troublemaker" you have to find Kiki in a random location in the Townlet. In case you answer the trivia question wrongly, the dialogue says that you have to find him again. But Kiki does not respawn anywhere else, so you can simply click on him again, as he is still standing in front of you.
Other mistake: In the cutscene at the end of chapter 4, it is said that Ikki was hit by "This own technique", instead of "his own technique."