I'm just starting but I can tell you what I learned that I would have never thought would be a problem.
1) I now do a back stitch on all seams that are on the very outer edge. They can and do pull apart when putting on the frame.
2) I now make sure ALL seam allowances are going one way....looks better and especially, if doing SID, it helps.
3) Where seams meet (the intersections), I now pound mine down so the machine doesn't drag the interesection or make a boo-boo. This isn't too much of a problem with meandering, but when doing a computerized quilting design, it does matter (at least on mine, it does).
4) I am more concerned and finicky about cutting loose threads on the back. I just did a quilt (my own, thank God) where the dark thread shows thru on the white top. A little extra time would have made a big difference.
5) Just did a customer quilt -----they pieced the backing -- which would be fine, but please piece it with the same color of thread (white on white or cream on cream batting). They did it in green -- and yip, it showed thru on the white pieces on the top.