Ok, I'll throw out my .02
I have sort of watched this thread from the beginning and was curious to see how close to the 90 days it would come out. I am a builder by trade for 30 plus years and do only top quality work.
The trim should be square joints, square trim = square joints, they should be biscuit jointed, glued and sanded. You put a bow tie on a pig and it's still a pig. What I mean by that is you have basic plain paint grade trim. The more you try to doctor it up the less it will fit in.
I have NEVER seen t&g glued to sheet rock like that. Wood has to come and go with the weather, a simple fact. The butt joints should have been a 15-20 degree bevel thereby being able to make them look much better (with the help of a block plane) and the grain can be matched it's called end matching.
The doors look like someone over insulated them and bulged the centers out, was spray foam used? It can expand too much if you don't use the proper type. I have one question, are they pouring concrete up against that trim board? If they are that will be trouble down the road as the trim will rot out and quick from the lime in the crete.
As far as the hardwood floor going down after the baseboard, we would never do that in these parts, again, wood has to come and go with the weather. We put the base on top and use a shoe base moulding.
It's good that you are keeping an eye on the builder but at the same time it's very sad that you have to! I take a lot of pride in my work and stake my reputation on every job we do. I think pride and craftsmanship are going by the wayside and that is a shame.
If the supervisor is overseeing 8 jobs then it sounds like the builder needs more supers! I know if someone were to find and post such work of mine I would go ballistic! In the first place it shouldn't happen and in the second place I would be so embarrassed.
It only takes one bad rap for people to remember what a hack you are or were. Good luck on the rest of the build.
dave