Young Kidaichi's Murder: File 1 - S2-E1
Other mistake: Miyuki notices the pager beeping and finds out that Kindaichi gave it to her without her noticing. In fact when he said goodbye to her, the keen-eyed viewer can actually spot him slipping her the device. There are a couple of slight problems with that; first, she retrieves it, not in frame, from her left side, but Kindaichi put it on the right side of her person. Second; she is wearing a white skirt with no pockets. (00:20:15)
Young Kidaichi's Murder: File 1 - S2-E1
Other mistake: Kindaichi escapes handcuffing the detective to the toilet's chain. Try to think of the last time you went to a restroom and the chain was SO long that you could yank it across the whole room (not stall, room) and outside the door. Going behind the sink's drain, even. Never seen a toilet like this in my life (and in that kind of bathroom, you have usually buttons or pedals, anyway). (00:21:00)