One of the points of this thread, as I see it, is that the catalogs are/were, set up months, and sometimes even a year or so in advance. This is called "lead-time" and within that lead time there is plenty of fluidity that can, and does, occur. So to say that they are absolutes to the real world and that a catlog is the be all, end all, is not fair to all collectors.
Having been in manufacturing, from a management standpoint, we always had to make sure our disclaimer was in place before the printer got the final say on the materials. Even in the manufactured home industry, where home specs remained fairly constant, still there could be regulatory changes that would make certain specs obsolete. Having a retail base to maintain, they will hoard printed materials and re-print them and many times could be years out of date. In the drum industry, marketing is not everything, it is the only thing that gets top billing. Without marketing materials for people to read, they go from music store to music store and get very confused when each retail outlet has different display models, in different colors and prices....