And of course Columbo's car has a cameo appearance in the Rockford Files pilot episode, "Backlash of the Hunter". RF used a few moments of film from "Columbo - The Most Crucial Game" for an establishing shot. Both shows are Universal productions.
I noticed Sian Barbara Allen is in an episode.
I saw the one with Jude Farese yesterday, he plays a henchman who keeps hitting Rockford. Still haven't seen part 1 of the story where I suppose Susan Jacoby appears.