Thanks for taking a look and sharing your impressions of it.
And yeah, I don't know about the weld spatter explanation either. As far as I (and the dealer) are aware, the rear window has never been replaced. At the same time, I can feel raised bumps through the tint film that are way too hard for me to think that they are air bubbles. I don't know what it looked like after the first attempt that he decided to scrap and start over, and I don't know what it looks or feels like if someone scraps a tint job but fails to clean off the adhesive properly before doing round two. If I was running a business like this I'd be sure to show the customer each step of a job that wasn't going as expected, especially if I believed I wasn't at fault, which is where most of my dissatisfaction comes from. I was in their waiting room the whole time it was being worked on and nobody said anything to me until it was finished.
As for the other windows, I'm definitely going to complain about the rear fixed windows now that I've had time to think about it and got some other feedback. The seams look bad (I assume they aren't actually stuck down at the very edge? Which makes me concerned about longevity too...), and those bubbles can't really be explained as anything but installer error imo.
Could you tell me if tint not sticking to the edge of rear windows (where it looks kind of like halftone dots as the glass changes from clear to black) is normal? And the same with the wires for the rear defroster? The tint creates an effect almost like a lens flare when there are headlights behind me at night.