David McCallum or Ducky Easter Eggs:
- When Palmer enters Ducky's house, he greets Ducky's corgi whose name is "Solo". David McCallum played Illya Kuryakin in the TV show The Man from U.N.C.L.E. (1964). He is partnered with Robert Vaughn who played Napoleon Solo.
- At the homeless encampment, on the street in the background is a moving truck. The name on the truck is "Great Escape Van Lines". David McCallum played Ashley-Pitt "Dispersal" in the movie The Great Escape (1963), who removed debris from the clandestine tunnels under the Nazi prison camp.
David McCallum died of natural causes on September 25, 2023 in New York City; he was 90 years old. He played the role of Forensic Medical Examiner, Donald 'Ducky' Mallard, since the backdoor pilot on JAG (1995) (Ice Queen (2003) and Meltdown (2003)). He was also known for his second longest running role in The Man from U.N.C.L.E. (1964) as Illya Kuryakin, and Ashley-Pitt 'Dispersal' in The Great Escape (1963).
National (or State) Flowers sent from NCIS Field Offices and other locales:
- Thistle - Scotland
- Magnolia -State flower of Louisiana and Mississippi (New Orleans office)
- Roses - California (the Official Flower is the Bird of Paradise for the City of L.A. and California Poppy for the State)
- Cherry blossoms - Japan (Far East office)
- Golden Wattles: Australia ( Sydney Field Office)
- Plumeria - Hawaii (Pearl Harbor)
The text of the In Memoriam at the end of the episode reads: "In memory of our dear friend and colleague / David McCallum / [photograph] / We will miss you".