Often with history-based podcasts (either real history or like historical crimes) I don't know enough to ever contradict them, but then when I hear them cover a topic I know very well and realize how many mistakes they make or that they sometimes use suspect sources.
Often times, one of the subjects this happens with is the Kennedy Assassination but for different reasons.
Like with one it is how many political facts a podcast got wrong like calling Gerald Ford the Speaker of the House (he was House Minority Leader) or calling Arlen Specter a future Congressman (he was a Senator), etc.
But in a totally different podcast it was using Vincent Bugliosi as his primary source on the assassination who my knowledge of a different case (Charles Manson) has taught me is a corrupt and insanely sloppy prosecutor and writer/researcher both who bungled every bit of the Manson case and made people believe incredibly incorrect things about it for decades.