Alan Kupperberg revealed in an interview with Daniel Best that he pencilled the Batman head in the left border on a lark and Neal Adams inked it. The rest of the heads are stock shots pasted in later. The Kupperberg-Adams Batman head was subsequently used on other covers.
Logo design credit from Todd Klein's Logo of the Day #2268 posting to his Facebook page on 8 November 2018.
Forecast for Tonight... Murder! Story on Interior Page(s)
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Credits for script, pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics.
Target for Mañana! Story on Interior Page(s)
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Credits for script, pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics.
Story continues in Detective Comics #421.
[untitled] Letters Page on Interior Page(s)
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Letters of comment from Tom Peyser, Jay L. Zilber, Tom Greeniones, Bob Rozakis, Kenneth P. Greene, Pittsburgh Sam, Peter Marzano, Bob Abrahams, Gerard Triano, Jack Stein, Scott Gibson, Allan Ferguson and Mark Lucke.
X Marks the Mystery! Story on Interior Page(s)
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The Man Who Robbed a Thousand Minds Story on Interior Page(s)