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)