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Jethro Gibbs's father Jackson Gibbs (played by Ralph Waite ) was a World War II US Army Air Force fighter pilot, as was Mark Harmon's real life father Tom Harmon.

A satellite image of the Santiago Bernabeu Stadium in Madrid sometimes appears on Gibbs' computer.

In addition to Troian Bellisario, one of Donald P. Bellisario's children, who plays as McGee's sister, there is also one of his sons, Michael Bellisario, who played Charles (Chip) Sterling on the show.