Alterations were demanded by the Comics Code Authority.
Romita altered the Red Skull's head to make him less frightening. The unaltered cover was used on Marvel Super Action # 2. Info per Nick Caputo, August 2012.
Letters of comment from readers Sid Root, Pete Snyder, Scott Johnson, Don Sampson, D. Smith, R. Steinke, S. Tillman, Mike Brown, Rodney Koivisto, and Laird Scranton.