Brian Wiles, the actor who portrayed Officer Andrew McGuiness, also played a corrupt Police Officer in Person of Interest (2011).
James Carpinello and Sarah Wynter also appeared in Person of Interest (2011). Sarah as a identity thief and James as a veteran turned crook who then became an agent of the Machine. James' wife in real life - Amy Acker was a series regular and the analogue interface/avatar of the machine.