A review by chaoticbibliophile
So Fetch: The Making of Mean Girls (And Why We're Still So Obsessed with It) by Jennifer Keishin Armstrong

funny informative lighthearted fast-paced

Fun and well-researched, but I would say that the cultural commentary is definitely secondary (and a bit repetitive) in comparison to the "making" part. If you're a fan (but maybe not a superfan), you'll enjoy this. The audio narrator was excellent as well.