When Morgan is talking with Sara early in the episode she says "the firm, where the victim worked, Baker, Smith, & Capaldi". "Baker, Smith, and Capaldi" is a reference to Doctor Who and the actors that play the lead of The Doctor. Specifically, the 4th (or possibly 6th), 11th, and 12th Doctors. Tom Baker/Colin Baker, Matt Smith, and Peter Capaldi, respectively.