Page is a not externally linkable
phranque - 11:14 pm on Jul 26, 2011 (gmt 0)
the problem described in the OP is "Duplicate title tags" which is in the "HTML suggestions" section of Google Webmaster Tools.
each title entry is linked to the list of urls on your site where that duplicate title was found.
if a requested/referred url is 404 then there is no title tag/no duplicate.