Ooooh yeah. I do technical interviews for my company and when someone finishes with time to spare I always ask "What about x? How does that affect our solution?" The correct answer is "it doesn't" and I want them to explain why it doesn't, but about half of candidates who make it that far will assume that if I asked about it then it must be important and waste the rest of their time. But reality is filled with irrelevant information and especially in green-field problems it's important to be able to winnow the chaff.