@GreggPath: The stub was untouched, so dealing the "true" turn and river was no problem.
@tommarsden: The folded cards (from the player in the middle) were mucked but still clearly identifiable. So unfolding was possible.
My interest in the hand is mostly academic at this point but I have gathered more information and can fill in some more details. The Hero in my story (the player most hurt by the mistake) really flew off the handle when the dealer unwound the action, pulled the wrong Turn off the board and dealt another one. He tabled his hand to show that the bad Turn had given him a full house and started to rant and rave... then shoved all in and lost the hand.
In retrospect, I think that my dealer handled it as best he could (given the errors), but it was simply a bad situation.