The Death March of Young Kindaichi File 1 - S2-E1
Character mistake: For being a genius raised abroad, Takato's English pronunciation is abysmal - check out when he says the line about the magic crystal on stage. (00:12:40)
Inspector Kenmochi the Murderer File 2 - S1-E20
Character mistake: Not only the program of the police station computer misspells "Matching" missing the I, but the operator says that the print on the right is Kenmochi's and the left print is the one taken from the device; it's the other way around. (00:19:20)
The Prison Prep School Murder Case File 2 - S1-E11
Character mistake: When we first see Kindaich in English glass, the blackboard behind the masked teacher shows the word "grammar" misspelled into "grammer." (00:12:10)
The Prison Prep School Murder Case File 1 - S1-E10
Character mistake: To show how hard the top students are working at the prep school, we see one of them writing; "I was at the course of a eight-week intensive." (00:04:50)