These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Death of the Author: One of Asimov's favorite stories, "The Martian Way", was a way of using his claustrophilia as an attack on Joseph McCarthy. In it, a McCarthy counterpart named "Hilder" is almost able to become Global Administrator at the cost of space development. Nuclear "proton micropiles" are used to produce energy almost for free, and are used in pumped steam rockets to colonize the solar system - so Hilder whips up scare reports on how space travel will eventually turn the Earth into a desert. Asimov's Martians, being immune to Space Madness due to their upbringing as claustrophillic Space People, are able to make a three-year trip to Saturn, retrieve a cubic mile of ice from its rings, and return in time to make a complete fool of a visiting bureaucrat who previously stated for the record that Earth cannot spare a single drop of its one and a half quintillionnote 1,500,000,000,000,000,000 tons of water. As an attack on McCarthy, it flopped. As a modern-day attack on environmental alarmism, it works. The ironic part is that Asimov was an outspoken environmentalist.
Fanon Discontinuity: Foundation and Earth is basically just an excuse for a big crossover with the Robots series and doesn't make much sense compared to the earlier Foundation books.