Of course, there are many mistakes, but it would be way to difficult to remedy them all. But I don't really care about those mistakes, because other things are really good. I mean, I totally understand it when adults seem to dislike this. It's made for kids. And kids aren't that critical about such mistakes. "Jesus & Josefine" used to be my favourite series. And still, I love watching it. 10 out of 10! definitely! When you love Scandinavian youth movies, I recommend this for sure!
I have never seen "Oscar & Josefine" but it seems to be quite the same, only in the Middle Ages. So if you can't get enough of that blone, a must to!