When Kate and Daniel are talking in the elevator, the selection panel shows that floor 13 is missing. Many buildings superstitiously omit the 13th floor, alternatively labeling it so as to avoid the "unlucky" number, and in shots the panel shows that the buttons jump from 12 to 14.
The defendants name is Billy Flynn, the same name as the "hotshot" lawyer in Chicago (2002). The musical about Billy Flynn trying to get his clients off of death row for the murders of their lovers, the same situation as the character in this episode finds himself in. They are both set in Chicago.