As part of the Nucleic Acids Research's database issue, the PDB has a paper entitled "The PDB data uniformity project" that describes the data uniformity project that is underway to address the inconsistency in the archive.
T.N. Bhat, P.E. Bourne, Z. Feng, G. Gilliland, S. Jain, V. Ravichandran, B. Schneider, K. Schneider, N. Thanki, H. Weissig, J. Westbrook and H.M. Berman (2001): "The PDB data uniformity project." Nucleic Acids Research 29 (1), pp. 214-218. http://nar.oupjournals.org/cgi/content/full/29/1/214
Updates on the Data Uniformity Project are available at http://www.rcsb.org/pdb/uniformity.html.
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