only have one at my fingertips:
http://tinyurl/nvzfar

It seems to be pretty straightforward... and the parse completes... both with HTML::TokeParser and WWW:Mechanize. The failure occurs some fixed amount of execution after the parse is finished. Even if just stacking meaningless prints, it fails... (only tested in Mechanize)

Let me say this again: after this loop:

  foreach my $link (@links) {
    print "LINK: " . $link->url() . "\n" if ($DEBUG>=1);
    push(@anchors,$link->url());
  }
  my $goodAnchors = 0;

  print " @ 1ANCLOOP\n" if ($DEBUG>=1);
  print " @ 2ANCLOOP\n" if ($DEBUG>=1);
  print " @ 3ANCLOOP\n" if ($DEBUG>=1);
  print " @ 4ANCLOOP\n" if ($DEBUG>=1);
  . . .
  print " @ 29ANCLOOP\n" if ($DEBUG>=1);
  print " @ 30ANCLOOP\n" if ($DEBUG>=1);
[download]

BTW, I just replaced the link parsing code (used to use HTML::TokeParser) with WWW::Mechanize, and the same thing still happens, albeit at a slightly different place. Of course, the failure changes each time I add tracing prints... but is completely repeatable, down to the character it fails on in a print, if that's where it is failing.

it stops at "24ANCHLOOP" - 24 out of 30 meaningless print statements..

Not necessarily. Do you get the same result if you add $|=1;? You could be suffering from buffering.

and the buffering might be hiding an informative error message.