And yeah Tom Sawyer as a top 10 pick over Huch Finn is weird.
I actually knew that stuff about Flowers in the Attic. My sister told me. But they didn't include the entire series with that, like the did with the SF series'. They didn't include the entire Dune series either. Foundation got on there as a series but I assume that was for the first three books (which are really collections of shorter works) rather than the next four that came after a 30 year gap.