Currently, if a record has an 856$3, this will show in the brief results and not in the full results. It should be consistent between the two views. And what is the opinion that the $3 should show or should not? For decisions like these, it would be nice for the library to decide what is displayed and allow for changes to be made through the staff client vs XSLT stylesheets.
What do you mean by "brief results" and "full results"?