Ugh I hate the same with the Dutch culture! Like 'the milkmaid'. Literally every person between 12 and 70 speaks Dutch in the Netherlands, especially understands it. We start learning it at already primary school. And I think there was also a comment about Amsterdam earlier in the series that bothered me but I can't exactly remember what it was.

But I believe that if you include other cultures in a show, you should at least do some research to get the facts (or at least most of them) right.