The Prison Prep School Murder Case File 5 - S1-E14
Continuity mistake: When the mastermind does his dramatic escape, the policemen are in front of him (Kenmochi literally at arm's length), but there's nobody in his way when he throws his projectile. (00:18:15)
The Prison Prep School Murder Case File 5 - S1-E14
Plot hole: The victim managed to write a dying message with chalk on the inside of the locker, but the only moment when he could have done that was when his assassin was standing there watching him die waiting to drag his corpse away. Since the writing was basically the killer's name, it's absurd that the killer never bothered to wipe out the signs; it's chalk on hard metal, not a single trace would have remained. It also does not match the position of his hand in the second episode.
