a way to replace the stuffing (this helps if you purchase a larger bed, but don't have a washing machine capable of the size, removing the stuffing should be able to allow you to wash easily) through a zipper, or outer cover, etc
a guide at the beginning of the catalog for additional value if the variety is on a first day cover, has a bullseye cancel, is on a commercial cover, or is in a block of four or six
a boxed "Basics" section about each cat, giving vital statistics, such as length and weight, diet, litter size, and North American population estimates