When the Admiral leaves the Officers' Club, he tells Mark and Cynthia he can tell them all about the Korean conflict. Robert Symonds, who played the Admiral played Colonel Horace Baldwin in two episodes of M*A*S*H, set during the Korean War.
In the scene on the beach toward the end of the episode, Dr Greene recalls going to see an aircraft carrier and being afraid of its size and power. In the film Top Gun, Anthony Edward's character, Goose, is a Naval aviator who flies of aircraft carriers.
This is the second episode in this fourth season to take place entirely away from the ER at County General. In this case, it involves Mark Greene visiting his parents in San Diego after his mother suffers a series of strokes.
The trivia item below may give away important plot points.
At the end of the episode, the camera angle foreshadows the order the characters exit the show: first Doug Ross (George Clooney), next Carol Hathaway (Julianna Margulies) and finally Mark Greene (Anthony Edwards).