The duet "Not While I'm Around" comes from the musical "Sweeney Todd." Although it sounds sweet and tender, it is actually sung by Mrs Lovett to Toby just before she arranges for him to be murdered.
Markus Flanagan plays one of the lawyers in this episode. He played Phoebe's love interest in one episode of Friends, adding to the list of actors on this series who also appear on the famous 90s sitcom.