YMMV / Madicken

• Moral Event Horizon: Madicken's school headmaster is hated by all the children, not to mention that he's very politically incorrect by modern standards, with his views on how girls should behave and his tendency to let rich children off the hook. But he passes the Moral Event Horizon by subjecting a girl, who had stolen his wallet, to caning in front of all her class-mates. Madicken acknowledges that stealing is wrong, but the punishment is still clearly seen as too severe for the crime.
• Values Dissonance: The film and TV movie adaptations both feature a surprising amount of child nudity, with the film opening with Madicken and Lisabet running around their room completely naked, and the first episode of the TV show featuring them having a nude romp during a family outing. While none of it is sexual, it's still pretty jarring for modern audiences.
• What Do You Mean, It's for Kids? Especially in the second book, where the social Author Tract is a lot more pronounced. Alcoholism, child abuse, poverty and pneumonia are all described in a very realistic fashion.