A shot of a card Kojak's shows the number to the San Francisco Police Dept. Unlike the normal practice of using fake 555 numbers, this one is real and is still in use (but not by the S.F. Police). It's possible it was the actual Police Dept. phone number in 1976.
First appearances of Rosie Grier as bounty hunter Salathiel Harms, he would be featured again in Season 4, "Black Thorn" (1976).