There is a very quick pan of Mrs. Mallard's bedroom showing a black and white photo of Ducky and his father. This is an actual picture of David McCallum Jr. and his real-life father, David McCallum Sr., taken on March 16, 1966, at the home of the parents of David McCallum Jr. in Hampstead, London during a UK Promotion Tour of the NBC show, The Man from U.N.C.L.E. (1964).
Actress Nina Foch, who played the mother of David McCallum's character, Dr. Donald "Ducky" Mallard, was only 9 years older than David McCallum.
Kate, played bySasha Alexander, asks Gibbs, played by Mark Harmon, what Ducky, played by David McCallum, looked like when he was young. Gibbs answers, "Illya Kuryakin." McCallum played Illya Kuryakin in The Man from U.N.C.L.E. (1964) between 1964 and 1968.
As the opening credits roll, Anthony DiNozzo and Caitlin Todd discuss Filomena Restaurant. This is a very famous Georgetown destination, popular with movie stars, musicians, and Presidents. They are most famous for their Pasta Mamas, who make handmade fresh pasta in the restaurant window on Wisconsin Avenue, 15 feet from the C&O Canal. Filomena's menu offers fresh Italian food, wine, and dessert; however, they do not serve ice cream.