I'm a fan of any version with newscasts since I am a historian and these help supplement my collection of news radio broadcasts. I especially find it interesting when sometimes the newscast is not CBS News at the top of the hour and reflects how in some markets the Mystery Theater did not air on a CBS station due to conflicts. In New York for instance, WCBS, which was an all-news station refused to make room for the program (unlike all-news WBBM in Chicago and KNX in Los Angeles) so the program aired on WOR which for most of the 70s aired Mutual newscasts (hence why many of the WOR recordings have the commentaries by Fulton Lewis, III. These commentaries are rare pieces of radio history themself)

I have also found newscasts from ABC Information Radio (ABC at that point had split its radio network into four services aimed at different types of stations; Information, Entertainment, Contemporary and FM) on WDAF-Kansas City recordings from the first months of the Mystery Theater and even in one instance amazingly, an NBC News on The Hour from KFAB-Omaha.