S1 Finale-Remake of Ironside Episode
The S1 finale "An Elementary Case Of Murder" which has Barbara McNair guesting as an old flame of Mac's suspected of murdering her husband "Jason" is a very unusual episode. Not because of Sally's pregnancy that never got acknowledged again in S2 but because the episode is a recycling of an "Ironside" S2 episode from 1968 called "An Obvious Case Of Guilt." Only in that episode it was Anne Baxter as an old flame of Chief Ironside's who is suspected of murdering her husband "Jason". Much of the dialogue from the Ironside episode was recycled verbatim!
The same writer is credited on both episodes, and executive producer Paul Mason had also been "Ironside's" producer at the time of the original episode. In fact, actress Eve McVeagh appears in both episodes as well!