I'm just really not liking the look of the Honeydukes expansion. It looks so plain. I almost wish they had left the Zonko's shelves more or less as they had been but re-themed them to Honeydukes colors. Then, in order to make Honeydukes sweets available to more customers, I would have liked to see Honeydukes salespeople with cigarette-girl type sales boxes wandering in and out among the crowds or out on the Owl Post patio. That might not have worked for some of the meltier candies, but Bertie Botts' Every Flavour Beans, Exploding Bonbons, Sherbet Lemons, Pink Coconut Ice, Pepper Imps, & Fizzing Whizbees could be sold this way.
As for the Zonko's facade, I don't mind that the exit door is still Zonko's themed so much as the fact that you can actually see the interior of Honeydukes through the Zonko's door, from what I've heard. They should cover the glass with something so you can't see inside.
And I agree that the interactive window doesn't look quite right. Again, too plain. Or something.