Joel Fitzgerald is played by Reed Diamond, and while being interrogated asks if the room is called the box. Diamond played Detective Mike Kellerman on Homicide: Life on the Street (1993). In that series, the interrogation room was called the box.
When Sherlock is trying to unlock his phone that 'Everyone' has disabled he enters the code 1337...hacker speak for leet or elite. Johnny Lee Miller who plays Sherlock played Dade 'Zero Cool' Murphy, an 'elite' hacker, in the 1995 movie 'Hackers'.