What jokes did Shi Naian write in "Water Margin"?

I think there are three jokes in Water Margin. First, the story of Wu Dalang and Pan Jinlian is a joke in itself. According to historical research, Wu Dalang and Pan Jinlian were both real people, but it is not what we see. The real Wu Dalang was a county magistrate, and Pan Jinlian was his wife. Not a three-foot-tall dwarf. The author didn't know why he wanted to vilify him, so he wrote them as such a person. Secondly, I think Wu Song’s fight against the tiger is also a joke. Everyone knows what a tiger looks like. You can see it on TV or at the zoo. A tiger is a ferocious beast, extremely powerful. How could ordinary people beat it to death? I don't believe it. Thirdly, Lu Zhishen toppled a weeping willow. You can think about how strong a person is to pull out a big tree. This is impossible and a joke in itself.