Mari Gorman, who plays suspected prostitute Roberta Kerlin, is brought back as Officer Rosslyn Licori starting later in the 4th season, filling the open position of Det. Sgt. Chano Amenguale, last seen in the 2nd season.
When the electronic listening devices are first discovered, Harris says that it's like "1984" (the George Orwell book) and Yemana says "Or 1942." Yemana was referring to the government spying on Japanese-American citizens, and their eventual relocation to internment camps, after the attack on Pearl Harbor, something which Jack Soo experienced personally during World War II.