"I did not know what he would do, nor even what he had the power to do." (20.39)
Here, the Invisible Man tells Kemp about his experience in London with his landlord. In this part of the never-ending story, the Invisible Man is worried that the landlord might have some power over him. But the (legal) power that the landlord has is very different from the (illegal) power that the IM has (post-invisibility).
"If the straw makes trouble put it down in the bill." (3.28)
Notice how important money is in the first few chapters. When he comes in to the inn, one of the first things the Invisible Man does is give Mrs. Hall some money (1.1). Whenever he makes a mess in the inn, he offers to pay extra (3.37). It's not like the Invisible Man has any personal charm here. All he has to smooth things over with Mrs. Hall is his money.
He turned around abruptly. "I robbed the old man—robbed my father.
"The money was not his, and he shot himself." (19.42-3)
Stealing from his father is Griffin's first crime and it raises the same question as the previous quote: if the money was not Griffin's father's, where did he get it? Money can be mysterious in this book: flying through the air, appearing in all sorts of places, coming from unknown sources. Should we be suspicious of money the same way that people are suspicious of science?