Opera House Murder Case: File 2 - S1-E22
Other mistake: In the flashback with the sulphuric acid bottle dropping on Fuyuko, the bottle has still the cap on, making the incident as it is shown impossible. It should also be noted that there's a shattered glass noise, but in the previous episode we saw the bottle was perfectly intact on the floor and was even reused for a murder (although how could the culprit be in possession of it is a mystery - it's the same one since the stain on the label is identical). (00:15:55)
Opera House Murder Case: File 2 - S1-E22
Other mistake: When Okata discovers the clue about the first murder in the recording room, the shadow cast in close-up is different from the wider angle - and it's also an impossible one, because the only light in the room is the one of her own flashlight, which couldn't be angled at the trolley that way. (00:11:25)
Opera House Murder Case: File 2 - S1-E22
Other mistake: At the beginning of the episode, the characters are gathered thinking back about part 1 of the case. Amazingly enough, the propmaster's armpit ate the A of his shirt. Now he's not a "BADMAN", he's a "BADMN." (00:02:05)
Opera House Murder Case: File 1 - S1-E21
Other mistake: Kindaichi and Miyuki are chatting with the lead actor who is sipping a Coke. There's a fierce argument onstage between the actresses; somehow the actor, in full stage garb, calmly shows up onstage to catch the end of the argument way before the other two kids get in the room running. (00:10:00)
Hikou Isle Murder Case: File 1 - S1-E13
Other mistake: Miyuki manages to pinch Kindaichi's buttcheek while being in front of him, at an impossible angle. (00:06:45)
Hikou Isle Murder Case: File 3 - S1-E15
Other mistake: The cop shoots a hole through the box she's carrying - but there's the small detail that there's no opening at the back of it for her to stick the hand into and/or pull the trigger. (00:14:00)
Hikou Isle Murder Case: File 3 - S1-E15
Other mistake: A copper alloy statue knocks away like nothing a huge mass of gold ingots; gold is much heavier than copper, cumulatively the ingots weigh much more, and even if being simply piled on one another would cause them to be moved as the statue topples, it would never simply breeze through them.
Gentleman Thief's Murder: File 1 - S1-E10
Other mistake: A single wimpy guy on his own wouldn't be able to bury something as large as a painting in a rush without leaving any trace the police can discover.
Wax Doll Castle Murder Case: File 1 - S1-E7
Other mistake: Everyone rushes to Miyuki's position when she screams having found the first "victim." However, she screamed a while before already when Kindaichi scared her, and nobody ran to her then.
Academy's Seven Mysteries Murder Case: File 3 - S1-E3
Other mistake: The beginning of this episode does not match the previous one; Saki at the climax of the previous episode asked "Is that blood?" filming the scene, standing behind Hajime. In this episode he asks that when Kindaichi already turned around and grabbed him by the neck. (00:01:50 - 00:21:10)
Academy's Seven Mysteries Murder Case: File 2 - S1-E2
Other mistake: Kindaichi is afraid something might have happened to Miyuki. Finding blood, he has a flashback with several images about her. The final one though, the one with her sticking her tongue out and making a funny face, is something he can't reminisce about, since he wasn't there at the time. (00:18:40 - 00:21:00)
Academy's Seven Mysteries Murder Case: File 1 - S1-E1
Other mistake: Miyuki dirties her hand with ketchup leaning against a wall; however, the white wall has no red markings. (00:04:00)