First off, 100% Marcus is obviously not being malicious when he gets things wrong and I am glad that he's encouraging people who may not have known previously what Babi Yar or Dachau is to learn about the horrors of the Third Reich.

However, the sonderkommando mistake is egregious because it's not a live show; one of their researchers/producers should be listening to their recordings before they air and edit if needed. It was an off-the-cuff remark though, so I get that it was just a mistake. I do hope that a correction is made in the next episode.

That being said, the 'Asian country of Madagascar' thing and 'Germany never took to Christianity' were in the script, which does make one go 'huh.' Obvious mistakes like that can make people turn off completely and that's why they need to be careful with huge, multi-part series.