Corrected entry: The runes used by the soothsayers are supposed to have only one carved side. The carved side means that the answer to the question is "yes" while the plain side means "no". Because the chance of getting all four pieces of runes to show only carved or plain side at the same time is hard to achieve, the runes used when the expected answer is "yes" are actually carved on both sides while the plain runes are used when the answer is "no." That way, a minor scene could be completed without wasting time and movie reels. (00:40:45 - 00:41:35)
Phixius
30th Apr 2008
Correction: That sounds more like so-so trivia than a mistake. Since we can never see both sides of the runes at the same time, and after they've been thrown they'd be impossible to keep track of, this couldn't possibly be seen within the movie. So it isn't a movie mistake, deliberate or otherwise.
Phixius ★