In this episode we see a victim from a previous case; Sarah Walsh played by Sofia Vassilieva. Her character was first introduced in Season 13 Episode 6 "True Believers (2011)", where she is raped in her own apartment and her rapist is put on trial.
Munch has a tattoo of the word "love" on his right wrist. You can clearly see it when he answers the phone in the final scene.
Sofia Vassilieva plays rape victim Sara Walsh. A suspect of her rape was also a suspect in the rape of a woman named Celine Dubois. Dubois was the last name of her character in the hit television show Medium (2005).