Well, sometimes when the rails are extended to tighten the pockets up, it causes a problem with the pocket liner ears wanting to curl in away from the casting ear. I know that sometimes nails are used to try and keep the pocket liner ear held in place to look right but...a better trick to that problem is to use a 1/4" staple 1/2" long to hold the pocket liner ear in place as it won't pull out over time, and if you blacken the head of the staple with a black magic marker you'll never see the staple, and it'll never be in the way of a ball hitting it. The loop of the staple makes it much easier to remove when the table is being recovered as well, all you have to do is hook it with an awl and pull it out. As for the pocket castings fitting right, I'd have to see how they're sitting to see what's wrong if there is something out of line or not, but no...they're designed to line up correctly.
Glen