Cities Of The Underground

I tried searching for a thread but I haven’t found one.
I just saw the Dublin episode of this. It’s called Viking Underground. Are all episodes of this as littered with inaccuracies as this one?
Another observation, some of the Irish people are subtitled, some of them not. The working class guy in it is subtitled but the middle class people in it are not for the most part. Also, the subtitling contains some inaccuracies. Still, it was interesting enough. The dramatic music is a bit jarring though.

Sorry mate could you speak your post as I cant understand subtitles.