bumpski - 12:11 am on Jan 19, 2014 (gmt 0)
I have no problem with Google remembering all these pages, but what is important is these non-existent pages are still considered by webmaster tools, and Google, as pages that "internally" link to the home page of the site; this is not the case!
In one case, this has not been true since 2008, in the others, since at least 5 months ago.
Is this a bug?
Of course there are many bugs, but the only way to eradicate them is to point them out.
Publishing them (bugs) in WebMasterWorld is more effective than contacting Google directly.