Some degree of lee-way has to be granted surely. If the yardstick of being correct to the point of an obsecure reference in "canon literature" or following a book series by an exact, pre-defined chronology is what's needed when modding, then count me out. Some mods like Deano's excellent FRV or Charlie's Check the Bodies would never have been made.
And an elf with a lamb obsession? I'd rather play that in BGII then read about it in a
FR setting.
I also get the impression that conceptology is coming into play here. Baldur's Gate and its sequel had a sense of feeling right, even if some of the more obsecure references were fallible. When faced with compromising points that are of little or no importance to the end player,
ie ~you~, I think it is entirely acceptable that the publishers went for the right "feel of the game, even at the expense of "attention to detail.
And you can never have too many Easter eggs..!