In the scene where Castle and his mother are discussing the zombie, a lock of Castle's hair alternates from being down on his forehead and up.
The victim starts to work at 4.00 AM in NY to trade the Asian markets, but that's 5.00 PM in Tokyo, just as the markets are closing.
Any 1L would know that a confession obtained by threatening the suspect with assault/death would make that a coerced confession and be completely useless in court. In this episode, the suspect is pre-law and would obviously know this, yet the show suggests this single confession will guarantee a conviction.