Ghost Passenger Ship Murder Case: File 1 - S2-E5
Other mistake: Everyone present in the scene reacts to Kenmochi popping the police inspector badge out of his jacket pocket. That includes the female crewmember who is peeking from the corner behind Kenmochi and that can't see it at all. (00:18:00)
Ghost Passenger Ship Murder Case: File 1 - S2-E5
Other mistake: When the two horrible guys harass her, Miyuki and Kenmochi are both drinking wine. Miyuki is underage, and while certainly not technically and materially impossible for someone underage to drink wine even with a police officer present, in pretty much every episode when there's a party it is made clear both in dialogues and visually that underage characters are not having alcohol. They drew the wrong type of glass. (00:08:45)
Ghost Passenger Ship Murder Case: File 1 - S2-E5
Other mistake: In the initial flashback, the name of the ship ("Mary Celeste") is misspelled, appearing on the stern, is "Mary Celese." (00:02:05)