Does your world interact with other worlds or avoid them? Are there reasons for their policy (ideally it shouldn’t just be prejudice. For example the Fairy Kingdom despites humanity for its warlike and polluting qualities. Difficult one to argue against, isn’t it? We can hardly claim not to be guilty of that).
Having good foundations for your world doesn’t just mean showing how it works and runs, important though that is, but good reasons behind their policies will make your world and stories that much more convincing. You don’t want anything to sound an odd note, anything that might interrrupt your reader’s enjoyment of your work and think “Nah! Would never work!”.
Could your world’s attitudes change (for worse or better)? Say your world is anti any kind of interaction with other species but changes it mind later as it realises it could trade (for example) with this other species for things it itself is short of, who would take on an ambassadorial role? What mistakes would your world make (there's potential for both comedy and tragic misunderstandings there)?
Can people “see” your world? Does it make sense? Even the most fantastical world must have its rules to be able to function properly. Do your readers and characters know what these rules are? There must be something in your world your readers can identify with.
Does anything threaten those rules being followed (outside forces perhaps)? Is there a police force? What does happen to criminals in your world?
Is the government of your world accountable? Based on an earth system or is it unique to its situation? What happens to those who question it, rebel against it or do both, as in Eileen’s case?
Are the people or other species of choice able to vote? Are certain species barred from voting? Why?
What happens when your world faces external threats? Is there the equivalent of a UN or NATO? Does your world have traitors and who do they seek to betray and why?