than the late William D.Russell,durected for the CBS episodes of
Hazel"?

Two that immediately come to mind are Charles Barton and E.W. Swackhamer, both of whom directed many other Screen Gems sitcoms. They both did I Dream of Jeannie, and E.W. Swackhamer also did Bewitched, The Flying Nun, and Love On A Rooftop (Which I wish SOMEBODY would release on DVD).

Speaking of Love on a Rooftop, I read that this show had a famous guest star appearance in one episode. Wasn't it Rob & Katie from My 3 Sons that appeared in Love On A Rooftop? I think they were on their honeymoon in this Love On Rooftop episode. Is this right? If so, I'd love to have this episode.

While it's possible there could have been an episode with them, I don't recall it. It wouldn't have been too likely as My Three Sons was a Don Fedderson Production filmed at Desilu, and shown on CBS, while Love was A Screen Gems show presented on ABC. That show had a large list of great character actors who passed through the series, but I can't remember any featured guest stars.