Inspector Kenmochi the Murderer File 3 - S1-E21
Continuity mistake: When Miyuki offers the cake to Hajime-chan, the cup of coffee switches side of the table without her touching it - in fact her hands are busy with the cake, even. (00:20:10)
Inspector Kenmochi the Murderer File 3 - S1-E21
Plot hole: During the blackout, the people who will turn out in the next episode to be the killer and the victim say things (in monologue) and act in ways that don't make sense in relation to the plot and are merely meant to cheat the audience.
Inspector Kenmochi the Murderer File 3 - S1-E21
Continuity mistake: Kindaichi receives the keys of the building from superintendent Akechi. Notice the somewhat lengthy pieces of wire linking the keys to the large ring. When Kindaichi cracks the case and grabs the keys from his room telling Miyuki to go, the links are half the size they were. (00:19:55 - 00:20:45)
Inspector Kenmochi the Murderer File 3 - S1-E21
Audio problem: Kindaichi is listening to the recording of the phone call a couple times over; however he does not listen to it in a loop, but rather the file shows up as lasting 52 seconds, with the call being just a handful of seconds. On top of that, when he listens to it again in front of the building, the timestamps don't match.
Inspector Kenmochi the Murderer File 3 - S1-E21
Continuity mistake: When Kindaichi is listening to Busujima's call, the bead of perspiration (not a comedic one) on his face changes position between shots; in close-up it is located much higher above the cheekbone. (00:03:05)