In Monty Python and the Holy Grail (1975), the Bridgekeeper prevented any knight unable to answers his questions from crossing the bridge. Wrong answers got the knight tossed into the gully below. Think of the Bridgekeeper as your readers – who will toss your book aside if it is not answering their questions.
I write hard sci-fi and I have a WiP with a deadline that hinges on my understanding of something many sci-fi fans know more about than I do: Is quantum superposition universal? Getting this wrong in a hard sci-fi story has the same effect as say, firing seven shots from a six-shooter in an old west tale, or getting the royal succession wrong in a historical novel, or misusing DNA to identify the killer in a detective story. The knowledgeable reader dismisses the story as beneath his reading level.
Asking a science fiction group on facebook, “Is quantum superposition universal?” got me 35 knowledgeable answers. Now, I don’t know more about quantum mechanics than I did, but, I do know what most readers in my genre will accept.
I also learned that readers are not afraid to tell you what they expect from a good story.