Intriging Discrepancies

A couple of notable finds that reinforce Marc's reflections on inconsistency among records, and which have piqued my interest:

I. Translated Texts

245 Tea ceremony utensils
100 Ryoichi Fujioku
700 Louise Allison Cort (translation and adaptation)

245 Japanese arts and the tea ceremony
100 Joseph P. Macadam (translation and adaptation)
700 Tatsuaburo Hayashiya
700 Masao Nakamura
700 Seizo Hayashiya

Is the translator the main access point for Japanese Arts because there are three authors? Or is this just a case of incorrect cataloging?

II. Serials and Cutter Numbers

The Everson Museum publishes a serial catalog of Ceramic National Exhibition, but the two individual issues which the collection contains have very different call numbers:

050 NK4008 ‡b .C468 1987
111 Ceramic National Exhibition ‡n (27th : ‡d 1987 : ‡c Everson Museum of Art)
245 American ceramics now / ‡c Twenty-seventh Ceramic National Exhibition ; [editor of catalogue, Thomas Piché, Jr.].

050 NK4008 ‡b .A14 1993
245 The 29th Ceramic National : ‡b fiction, function, figuration.
711 Ceramic National Exhibition ‡n (29th : ‡d 1993 : ‡c Everson Museum of Art)

Why is the OCLC record so disparate for these items? Shouldn't they share the majority of information, save for a subtitle and an edition?