The baseball cap Harmon was wearing in Paraguay had the number 7 on it, from his football playing days at UCLA.
Many of the outdoor scenes are filmed in the Santa Clarita Valley area of Californa. just north of Los Angeles (i.e., Newhall, Saugus, Valencia). Gibbs and the team travel to Val Verde, Paraguay, for their mission. This name may have been selected because Val Verde (California) is located in the Santa Clarita area and was probably used for outdoor scenes in the past.
Erin Krakow played a character that was at first thought to be the widow of a sailor. On Army Wives (2007) she played the widow of a soldier.