The favorite Twilight Zone of Rod Serling's daughter Anne Serling. Watching she noticed several conversations between son Pip and father Pop were almost identical to banter she had with her father. Rod Serling nicknamed his daughter Pop, not Pip, and the final image on screen which fits the narrative was also a personal message to his daughter.
The script originally had Pip stationed in Laos, but the network had Rod Serling change it to Vietnam. Incredibly, CBS didn't want it set in Laos, as that country was at the time the scene of intense fighting and insisted the story be set in the more peaceful location of South Vietnam. This episode was produced about two years before the massive intervention of American forces in South Vietnam.
Bill Mumy's father rarely joined his son on sets, but joined him on this occasion because the two often visited the pier they filmed on. His father recalled being impressed with Jack Klugman who introduced himself to the family and explained that father and son would be extremely affectionate. Mumy joined his own son Seth Mumy on set of Dear God (1996) with Klugman 30 years later.
Features perhaps the first scene in American television set in the Vietnam War, the opening scene where a wounded Pip is brought into the field hospital. It's also one of the first American TV dramas to mention the conflict in Vietnam and feature a Vietnam veteran, although Route 66 (1960) had added a Vietnam veteran character earlier in the year.
One of only three TZ episodes to feature the line "Submitted for your approval" during Rod Serling's opening narration, which is probably the phrase most closely associated with the show that comes from those monologues.