This sounds like a bigger problem in theory than in practice. For starters, in practical terms, there's always a paucity of information about the game environment. There simply isn't time for really thorough scene-setting/description, and this lacuna leaves a lot of room for player-authored details.
Then there's the whole interpretation-thing. Aren't our game worlds always in a
bit of flux, because we aren't all imagining exactly the same thing, despite our most heroic expository efforts?
I mean, how clear a picture of the game world do we usually get?
Finally, there's good-old wild contrivance and coincidence (both lifelong friends to RPG's and the less-than-believable fictional genres that inspired them). Sure, you might ask precisely
where loin-cloth clad Thud the Barbarian pulled the hidden flask of Greek fire from. But do you really want to know? Next you'll be asking why Thud decided to spend the rest of his life camping and looting with three other fellows he met in a tavern one day

.