There are several FAQ entries that are, as Donald says, generally explaining how the card works, but not 100% correct in covering all edge cases. These have come up many times in forum threads, at least at BGG but probably here too. That's why some people say things like "the FAQs are useless, only trust the cards" - which of course isn't true either, since the FAQs are indispensable for learning how to play new cards, but you get the idea.
Just two quick examples I found, looking through the FAQs for the base game and Alchemy:
Philosopher's Stone: "If you play multiple copies, obviously the number will be the same for all of them."
That's only true if you play multiple copies from your hand. If you play them with Venture, the number could be different for the second Ph. Stone for instance. And the Venture FAQ doesn't mention this either of course.
Moat – "When someone else plays an Attack card, you may reveal the Moat by showing it from your hand to the other players and then returning it to your hand."
"Returning it to your hand" isn't strictly true, as you reveal the Moat from your hand, but the Moat never moved. It stayed in your hand. This can matter for edge cases having to do with lose-track I think (don't feel like looking into it now), but the way it's worded in the FAQ is perhaps the easiest way to explain how it physically works to reveal a card and doesn't cause problems in 99.99% of cases.