John Russell based his character, Dan Troop, on an officer he knew, when he served in the U.S. Marines.
John Russell was only forty-seven and looked even younger than that, when he was cast in this series. He believed that in order for a man like Dan Troop to have gained the kind of experience and maturity he possessed, he would have had to have been in at least his mid fifty, so Russell had the Make-up Department streak gray through his hair, and he lowered his voice when he spoke, in order to appear several years older.
In the beginning of the series, Dan and Johnny had a pet cat in the office. The cat disappeared during the course of season one, and its absence was never explained.
In order to attract more female viewers in season two, the producers started having Peter Brown leave his shirt unbuttoned.
Whenever someone fell to the ground, the same sound effect was used, regardless of if they fell off a horse, or while hiding behind a rock.
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