[quote name=\'Speedy G\' post=\'236496\' date=\'Feb 25 2010, 11:49 PM\']Don't they stop tape BEFORE the DD gets played if there's a dispute about an answer?[/quote]
Yes they do, because a change of scores affects DD wagering.
So OK, fine, I imagine you could make a case that in this most unlikely of circumstances, if they caught themselves in those scant few seconds between making a bad call and revealing the DD clue, they might be able to stop, reverse their ruling, and because the DD clue had not yet been revealed, AND because it was the last clue of the round, they could go back, recreate the moment (correctly this time) and have the correct player call for the DD clue.
Once the DD had been played, though, then that ship has sailed, and the only option for the player is the do-over.