According to Klein, Robinson was also probably responsible for the revisions to the logo over the next several issues.
There is an earlier chronological appearance (and origin) of the Joker in Detective Comics (DC, 1937 series) #168 (February 1951).
Robinson verified with Gary Watson in July 2009 that he did some penciling (including the Joker's card on the splash page specifically), in addition to the background inks and lettering he already confirmed.
This story was originally prepared for Detective Comics (DC, 1937 series) #38 (April 1940), but with the introduction of Robin in that issue, the story (sans Robin) was published here.
Oddity: Machine guns are mounted on the Batplane, which are used to kill.
The closing scenes of Batman battling one of the monsters look as if they were taken directly from 1933's film, "King Kong."
The Cat was later renamed Cat-Woman or Catwoman in the next issue.
An earlier chronological appearance was in Batman (DC, 1940 series) #52 (April-May 1949) and in The Brave and the Bold (DC, 1955 series) #197 (April 1983).
As recounted in various sources, the Joker was supposed to die of his stab wound at the end of the story, but the editors decided this villain was too good to kill off, so the last panels were re-drawn to show him surviving.
The last panel of the story, titled "Golden Rules for Robin's Regulars", introduces readers to "Robin's Code" of conduct. The code (ROBIN): Readiness, Obedience, Brotherhood, Industriousness, Nationalism.
This story was apparently intended for Detective Comics (DC, 1937 series) #40 (June 1940). The cover of that issue (shown in a promotional house advertisement in this issue) shows Robin trapped on a flagpole about to be chopped down, which occurs here. The villain also appears to be a recolored Joker.
Pin-up of Batman and Robin, found on the back cover, made to cut out and frame.