Trivia: In addition to his regular role as Harm, David James Elliott also played Harm's father in flashbacks scattered throughout the show.
Trivia: David James Elliott, Catherine Bell, and Patrick Labyorteaux were the only actors to appear in all ten seasons. Except for a few special episodes, Elliott and Labyorteaux were the only ones to play the same character, while Elliott was the only actor to appear in every episode.
Trivia: Donald Bellisario was originally against casting Catherine Bell as Mac. Since Bell had played a murder victim in the last episode of season 1, Bellisario felt her re-appearance as Harm's new partner in the first episode of season 2 would confuse the audience. Bell eventually won Bellisario over, and she remained on the show for the rest of the show's run.
Chosen answer: When landing on an aircraft carrier, a pilot "calls the ball" by confirming to the landing signal officer (LSO) that they have the carrier, and more specifically its landing guidance systems in sight. Carriers use a Fresnel lens system which is a light only visible at a certain angle, so if a pilot sees the "ball" they are at the correct altitude and glide slope for landing.
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