I subbed out the drywall hanging and finishing because I have other projects going on and was attempting to a hat trick. The homeowns are not happy because of all the seams are showing and there are nail pops everywhere
Stop the job. The sub is the problem. any nail that popped is not considered a fastener in the code, period (same as if paper is blown though by screw head). It therefore does not meet screw pattern by code. Many drywall subs today attempt a ONE PASS finish with mud. Some even attempt to spray the seams run the tape and then spray the texture in one day. It is NOT POSSIBLE to do and have any quality to the product. Eventually even the tape will fail and screw coverage pop loose.
Tape mud is mixed thinner and used to draw the tape TIGHT to the wall as it dries. It requires two more coats over it. Read on:
My neighbor just retired from Union drywall job where he and his crew averaged about 10,000 square feet a day. this is what he taught me.
It takes 4 days to drywall normally. Sheetrock up day one.
Seams and first pass with 4-6 inch knife, corners, fill screws day 2.
Second pass with 8 inch knife, reset corners, 12 inch knife pass on smooth finish surfaces day 3.
12 inch knife and touch up any corners early morning, texture and knock down 100% last pass smooth surfaces. wet sand as necessary when set. Set up FANS then:
THREE DAYS LATER PAINT CAN BEGIN. Read the specification on all sheetrock and mud products and paints, 3 days cure of all mud products is REQUIRED before paint. I never allow paint on any of my jobs until the 3 day cure. This includes HOT MUD. Hot mud sets and hardens but stays wet and not cured until 3 days!
If you can feel the tape joint with your hand you will see it. If they tried to finish in one day then they skipped the processes, the mud should DRY between coats or there will be issues with the finish. Stop your job and reject the mud job in writing. Give the sub 24 hours to come up with a "recovery plan" in writing. You can use several terms but "does not meet manufacturer defined methods and work not performed to 'workman like standards'.
No way I would touch it until it is done properly, redoing mud work after paint causes bubbles to surface in the mud. makes it worse not better.