I’ve already had one job interview where the applicant seemed broadly knowledgeable about everything we asked them during lead-in questions before actual debugging. Then when they had to actually dig deeper or demonstrate understanding while solving some problem, they fell short.

I’m pretty sure they weren’t the first and there’ve been others we didn’t know about. So now I don’t ask lead-in questions anymore. Surprisingly, it doesn’t seem to make much of a difference and I don’t need to get burned again.