"The commercials that get annoying to me are all the PSA spots that air on stations that clearly had trouble selling ad time locally to carry the Mystery Theater. You get an insight into which actors/comedians etc. need to pay their bills every time you hear them voicing one of the spots! 

The WBBM broadcast of Mystery Theater from 10/14/76 is interesting to me in this respect. Earlier in the evening CBS Radio carried Game 5 of the 1976 ALCS (Yankees beat the Royals) and my recording of this broadcast is also from WBBM so that means having the Mystery Theater airing an hour after the game with newscast practically gives me several uncut hours (save one) of one station for that night.

There is a WBBM local newscast from Christmas night 1976 *after* the Mystery Theater and how technical snafus led to a massive giggle attack by the newsreader Len Walter (who is still at the station today).  But even funnier was a CBS newscast after Mystery Theater on the night Muhammad Ali beat George Foreman and the anchor goofed and said Ali beat George *HERMAN* which was the name of a CBS reporter who hosted ""Face The Nation"" at the time. I fell on the floor when I heard that."