A few issues in the syntax highlighting done by Perl's bundle.
The first one I think it's typically hard to get right: here-docs are not recognised. This not only means that they are not colourised as strings, but that their content can fool the rest of the highlighting, for instance if there's an unbalanced quote. (Sometimes a fake comment can help there though.)
POD sections are not recognised either, so not only they are not coloured but Perl keywords are highlighted in regular English (for, if, while, ...).
On the other side, hash elements are no correctly highlighted. In
$foo{bar} = "baz";
the red for variables goes beyond the "{" and stops at the "r":
$foo{bar
If "bar" is quoted the highlighting is correct though, curlies in black and the string in green.
In the broken example I'd expect the curlies in black, and the key in green because it's autoquoted by Perl. Green to the left of =>s would be good as well, as words there are also autoquoted. Both conventions for autoquoted stuff are followed by CPerl and the Perl mode for Vim.
q(), qq(), and their variants are not highlighted as strings either.
-- fxn