It could be worse... I tried my hand for the first-time ever at detailing (Foam cannon + 2-bucket wash + Griot's Garage 3-in-1 Ceramic Wax) and managed to scratch up my taillights in the process
I suspect it was the water caught between the rear window and body that I blew out later with my air blower and I suspect that had a lot of junk in it which then got wiped across as I was trying to buff the wax.
But I have to agree, I am not very impressed with the paint quality after having spent a couple of hours up-close with it while applying the sealant/wax. Lots of "birthmarks" and even some nicks in the paint. Luckily no dents. Still looks stunning though