Interesting, but opposite take of how I see it:
The easy questions are still supposed to be easy, but there has always been ones that nobody would really know except for the single “obvious” answer, something such as (and I did make this question up just for the example since I didn’t feel like searching for a question such as this):
The Shinjuku Nishishinjuku restaurant is located in which of the following cities?
A: San Francisco B: Madrid
C: Paris D: Tokyo
Should be easy, unless you don’t know it’s an easy question and you realize that San Francisco has one of the world’s largest Chinatown sections. Now the contestant has to either take a chance on the answer and hope this was one of the writers easy questions meant for the $100 level, or a red herring question meant for the $25,000 level and burn a jump the question.