The title card for the scene taking place at Bull Dozer's apartment gives the address as 515 West 22nd Street. Most street addresses given for scenes in the various "Law and Order" shows are either fictitious or not the actual filming location. This scene, however, was filmed at 515 West 22nd Street.
Actress Melissa Sagemiller who plays ADA Gillian Hartwicke in season 12 appears in this episode as "Becky".
Benson and Stabler speak with a woman named Natasha, a former friend of Sonya's. This could be a reference to famous Russian novel War and Peace, wherein characters named Sonya and Natasha are initially extremely close but also have a falling out.