The Honor Guards you will see in this episode are actually active duty US Marines.
Jeffrey Dean Morgan who plays JD and Hilarie Burton who plays Anna Schaefer are married in real life and have a son together.
Jeffrey Dean Morgan (JD Richter) & John Billingsley (Dr.Mize) also worked together on episode 7.13, Judged (2016), of The Good Wife (2009), as Jason Crouse & Dean Randolph respectively.