The Death March of Young Kindaichi File 3 - S2-E3
Other mistake: Kindaichi in this episode watches the footage of the events in the previous episode from Saki's handicam. Saki was running with the camera and the camera was jerking up and down a whole lot in those animations, but here the motion is very subtle. Li also was standing facing straight away from the door, parallel to it, but here he's more turned to the left.
The Death March of Young Kindaichi File 3 - S2-E3
Plot hole: Kindaichi bases his solution on a fact (there was a certain object on the elevator together with the victim) he couldn't know about, since Li did not mention it (and if he did, he would have been on the right track to solve the mystery himself).
The Death March of Young Kindaichi File 4 - S2-E4
Continuity mistake: At the beginning of the episode, the distance between the suspects and the proportions are noticeably different from the end of the previous episode, and between shots within this very episode too.
Blood Pool Hall Murder Case File 1 - S2-E5
Continuity mistake: Miyuki listens her friend explaining the origin of the expression "Blood pool" related to the game of Go. Her hand is in front of her mouth, but in a shot it's an open hand, in another it's a fist. (00:10:10)
Blood Pool Hall Murder Case File 1 - S2-E5
Continuity mistake: When Miyuki points out that the atmosphere at the other table is rather gloomy, Amamoto has her chopsticks raised in one shot, absent from view in the next. (00:14:00)
Blood Pool Hall Murder Case File 1 - S2-E5
Continuity mistake: On day 2, Kindaichi joins the captain in the dining room. She's reading a book with a cyan cover sporting a yellow rectangle. He sits with her, and the cyan book now has a single yellow line, no more rectangle. (00:16:30)
Blood Pool Hall Murder Case File 1 - S2-E5
Continuity mistake: The police is surveying the crime scene; the stones lie in different spots on the floor between shots (or rather, the scale of the floor boards changes, and the stain and stones stay the same). (00:21:15)