The sonnet mentioned in this episode is Sonnet 116 by William Shakespeare. It starts with "Let me not to the marriage of true minds / Admit impediments. Love is not love / Which alters when it alteration finds, ..."
Scott Wilson and John Doman appear together here. There are strong parallels in characters they have played.
Scott Wilson played Sam Braun, former (mmm...) mobster and casino owner, revealed as the father of CSI Catherine Willows, in CSI.
John Doman played undisputed mobster Paddy Doyle, revealed as the father of CME Maura Isles, in Rizzoli & Isles.