Hiren Lake Legend Murder Case: File 3 - S1-E6
Plot hole: As it often happens in this sort of murder mystery, there's a switching act at one point, and one of the 'disfigured bodies' is not who it is presumed to be. Good, but the problem is that the presumed victim and the person who really died have radically different skin tones, and it'd be practically impossible for anyone who knows them to mix them up - even moreso for the genius detective Hajime Kindaichi.
Hiren Lake Legend Murder Case: File 3 - S1-E6
Plot hole: Kindaichi's denouement can happen only because the killer misses half a dozen people leaving the cottage covertly; Kindaichi does not have a clue of the killer's observation point, and despite what the detective says, the killer was not just listening, but watching them too with binoculars. Moreover, moving a microphone sensitive enough to capture the sounds of the whole room would produce noises which would have alerted the killer that they were tampering with it.
Hiren Lake Legend Murder Case: File 3 - S1-E6
Plot hole: The plan of the killer relies on a couple of pretty strong coincidences, such as the fact that they wouldn't realise their common link (he knows nothing about what happened on the cruise, so he couldn't know that they all wouldn't realise they have met before) and the fact that the boat is discovered at the perfect time for him to commit murder (on someone who wasn't part of the trip, but is willing to join him).
