The Table Captains and shift ACJs should really monitor this and correct the judges, as needed. Table Captains, in particular, hear the cross-talk and read the written judges’ comments and should catch and make on-the-spot corrections when they hear or read comments about accuracy. ACJs should also catch written comments about accuracy that are reflected in the scores, but I also know that it’s impossible for the ACJs to read every comment on every score sheet as they check the math on the judging packets.
Really, the Table Captains need to provide the leadership to keep a lid on this issue. This is one reason why teams shouldn’t be composed of a group of guys who are all from the same club. They tend to already have group norms and formal-informal leader status built-in which can really go off on tangents in the wrong direction.
It is, however, perfectly acceptable for a judge to make a written note about some accuracy issue, but he or she should never base their scores on accuracy.
So, I do occasionally suggest in my written comments that the modeler should check his or her references or perhaps do a bit more research into this or that aspect of the subject, but I also caveat any such comments with a statement that I did not use that observation when I scored the model.
I will say, though, that sometimes accuracy issues or problems are literally constructed into the model by the builder. In cases where, for example, there are clear bilateral differences in things like gaps and seams or suspension alignment, both ways that the modeler constructed those things cannot be correct. Either the open seam or gap exists on the prototype or it doesn’t. One side can’t have the seam and the other side not. Or the toe-in/out on one front wheel on a soft-skin doesn’t match the other front wheel. One way or the other is correct making the other one wrong, from an “accuracy” standpoint.
(As always, though, there can be visual clues or explanations presented that explain such things, so the judges still should seek to find an answer before finalizing their scores.)
So, there can be “logical” accuracy issues that do not require a subject-matter expert to identify and which can result in loss of points in one of the scoring groups (usually construction or finishing).