Vague recollection as well, but I do remember Gene breezing past the Round 2 questions and muttering something about not needing them. Don't recall them playing the R2 questions for the tiebreaker, though. As a technical matter, it goes against the rules.
I don't suspect it happened very often, given the R1 questions are designed to not have a definitive answer (and to happen twice in the same round).