Karina Logue, the actress playing Lisa Munson, is the twin sister of Donal Logue, well known to SVU viewers as Captain Declan Murphy.
This is the last episode in which Warren Leight serves as executive producer/showrunner until season 21's I'm Going To Make You a Star (2019).
ADA Barba is threatened by a man who is subsequently identified as "Felipe Heredio, a lieutenant in BX9" whose brother had been put away by SVU "a couple of years ago." The brother being referred to is "Rigo Heredio" from the Season 15's Betrayal's Climax (2014). The two brothers - Felipe and Rigo - were both played by the same actor, Johnny Rivera.
Brad Garrett plays a corrections officer in this episode. He also played a cop in the NYPD whilst starring in Everybody Loves Raymond (1996).