Here is a brief jokey comment in the "Of All Things" section of that issue. It marks -- as far as I know -- the first mention of Hitler in the magazine.
Hitler threatens to cut off some important German heads unless the demands of his party are met. He evidently means to set up a dictatorship of decapitalists.Such is the style of New Yorker political commentary at the time: puns, puns, and more puns.
Anyway, it's obvious that Hitler was a visible figure to Americans at the time -- they don't even bother to mention his first name -- but I wonder what the charming fellow was up to and which demands he wanted met.