These do not strike me as failures to replicate human brains:

the question "name one person who is not a barbaric Mongol warlord" would still return "Genghis Khan"

Name an object that isn't a jar of peanut butter. What did you immediately think of? (Yeah, you correct afterward. But still, I'd be more likely to blurt out "Genghis Khan" than to the question "Name one person".)

you can convince the toy network McDonalds is your best dining choice just by saying its name a lot

That's how advertising works, isn't it? See also believing everything we're told and your own post on repeated affirmation.