The "Briscoe" referred to a few times in this episode, and other episodes in this season, is not Detective Lennie Briscoe from the original Law & Order (1990) and is not a character being mistakenly referred to as Briscoe. The Briscoe being referred to is Detective Ken Briscoe, nephew of Lennie Briscoe, who was stationed in Manhattan SVU in 1999 and 2000. Ken Briscoe was played by actor Chris Orbach, who is the son of the actor portraying Lennie Briscoe, Jerry Orbach.
Detective Brian Cassidy's incompetence is once again demonstrated when he uses the incorrect phrase 'Mr Jekyll and Dr Hyde'. The actual line should be 'Dr. Jekyll and Mr. Hyde'.
This is the first episode in which Detective Olivia Benson has a stalker.