"The first group, though relying on nothing more than instinct -- what Gladwell calls "thin-slicing" -- turned out to be right."

No they were not relying on "instinct". They were highly trained in their fields. And though they could not, at the moment, articulate why they thought the object was a fake their WELL TRAINED AND HIGHLY DEVELOPED intuition told them something about the object wasn't authentic. The lesson most certainly wasn't "...that a little knowledge can be better than a lot of knowledge..."
Further while the book was a nice read, it's propositions are arguably very dubious.

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