Inspector Kenmochi the Murderer File 1 - S1-E19
Other mistake: The police is searching the crime scene of the supposed suicide. The police was alerted because the suicide happened by drowning, leaving the bathtub running till it overflew alerting the other people in the building. The body of the victim is still completely immersed in the bathtub (nobody drained it), and Kindaichi and Aoi walk on a dry floor while there should be a massive flooding.
Inspector Kenmochi the Murderer File 1 - S1-E19
Other mistake: When Akechi drives Kindaichi to the scene of the shooting, the tachometer of his car is set at 0. (00:14:00)
Inspector Kenmochi the Murderer File 1 - S1-E19
Other mistake: Hajime ends the conversation with Miyuki, but the screen on her phone still shows the conversation going. (00:13:50)
Inspector Kenmochi the Murderer File 1 - S1-E19
Other mistake: There's a coloring mistake in the glass in front of Busujima in the shot when finishes playing his handheld game and sends the waitress away; the glass is half empty / half full...but vertically. The part to the right of the straw is full to the brim and the part to its left is nearly empty. (00:10:35)