where the hell is the PB pet?

There's actually a tag on each black friday item that gives it the scrolling sale border (class = 4). Probably what happened was that Nexon tried to remove the two pets from the sale but screwed up somewhere with non-Scania/Bera servers, causing every item after them to glitch up.

I think the thing they were trying to fix was the shop mushies. They'll lose out on too much money by releasing 100 of those shops.