Daniel D'Addario Chief TV CriticAmazon Prime’s new animated series has a zany, anything-could-happen sensibility. Which makes it a little disappointing that what usually does happen is a bleeding-edge cultural reference.To be clear, “Fairfax,” about a group of middle-school hypebeasts (which is to say, streetwear obsessives) coming of age in image-obsessed Los Angeles, is often very funny in how far it’s willing to push its media-saturated sensibility.