I cannot see anything to cause alarm. It sounds like a quality of finish issue and not something that would be typical of a home inspection report.
Subject to the laws of physics and land use regulations, any construction project is possible if sufficient resources are devoted to its completion. Whether it makes personal or economic sense to reduce the planar deviation of the floor is something that each of us has to decide for ourselves.
What about velcroing through the screen, then sticking another piece on the back, basically making a velcro frame around the screen? This is hard to explain, here's a diagram:
AAAAAAAAAA
LLLLLLLLLL
SSSSSSSSSS
HHHHHHHHHH
AAAAAAAAAA
AAAAAAAAAA
LLLLLLLLLL
HHHHHHHHHH
AAAAAAAAAA
FFFFFFFFFF
The first 2 rows (AL) are one piece of velcro, loop side, with the adhesive away from the screen (leave the backing on this adhesive).
Next row is the screen (S)
Next 2 rows (HA) are another piece of velcro, hook side, again with adhesive away from the screen (backing removed from this piece).
Next 2 rows (AL) are another piece, loop side, adhesive against the previous piece so they stick back-to-back
Everything above here is on the screen (removable). Everything below is fixed to the wall.
The next 2 rows (HA) are the velcro stuck to the frame, and finally the F is the frame.
Best Answer
The adjustment is usually under on the wall part of the bracket. The bracket needs to be plumb in both planes (kind of left and right and then forward and backward).
The better brackets are bolted back to the wall and then micro adjusted (via small adjustment grub screws) in all planes until absolutely spot on. Then assuming no play in the arm, all should be well.
Have seen a few that are very difficult to get right in all planes though. I.e, TV looks good pushed back but wrong when pulled out etc.
Using serrated spring washers helps hold the bracket firm if the problem is caused by bolt heads slipping in bracket slots.