I never liked the print syntax. That whole optional-parameter-but-with-no-comma thing really gets my goat. I'd rather just always use select instead of sticking the filehandle in the print statement, but I don't. It eats me up inside, I tell you.
I can never remember what the syntax is for taking a slice on a hashref. I have to fiddle with it every time, no matter how many times it comes up. Rather than dealing with an appalling mess of curlies and sigils, I would really liked to have had a slice operator that could be used like my @stuff = slice $href, qw/key1 key2 key3/; Yeah, I could probably write it myself, but I'm lazy.