Thanks poj, I first have to extract the "review-content" elements, and pull the span out of those. So I don't have that HTML snippet to work on directly. A nested look_down fails:

for my $page (@$review_pages) {
    my $html = get $page->[1];
    $html =~ s/([^[:ascii:]]+)/unidecode($1)/ge;
    my $tree = HTML::TreeBuilder->new;    # empty tree
    $tree->parse($html);
    print "Review for $page->[0]\n";
    my @items = $tree->look_down( 'class', 'review-content' )
      or die("no items: $!\n");
    for my $item (@items) {
        my @meta = $item->look_down( '_tag', 'meta' ) 
          or die("no meta: $!\n");    # dies here
        for my $meta_item (@meta) {
            print $meta_item->attr('itemprop');
            print ' = ';
            print $meta_item->attr('content') . "\n";
        }
    }
}
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