The one that gets me presently is "return" statement with explicit "undef" at line 942, column 5. See page 199 of PBP. I'd like to know when being explicit has ever been a problem. I'm almost tempted to buy that book just to see what the argument is on page 199. Almost.
in reply to Module Announcement: Perl-Critic-1.01
Update: Ahh, I see... I hadn't thought about list context since the function only ever returns scalars and the results are all checked with if defined $scalar_name. I'm going to go ahead and stick with return undef if $something for functions that only return scalars and consider the advice given by Perl::Critic to be educated guesses or tips.