Epistemologists generally agree that the objects of propositional knowledge are true propositions. That is, if one knows that p, then p is true. To put it another way, propositional knowledge (knowing that) is supposed to be factive.
Now consider how we sometimes say that we learn (i.e., gain propositional knowledge) from works of fiction, such as novels and films. For example, from reading or watching Requiem for a Dream, we can learn something about drug addiction.
In this review of the film, the reviewer seems to suggest that Requiem for a Dream teaches us facts about addiction. But how can that be? After all, Requiem for a Dream is entirely fictional. How can we learn facts about addiction from a fictional film or novel? If knowledge is factive, how can we learn facts from non-facts?