Incredible Hulk, The (1968 series) #219

A very good issue with stupendous script and artwork, the first part of a two-issue story, yet it became a sort of infamous comic because the artist, Sal Buscema, not hurting his fame as the ultimate Hulk artist in the opinion of many, accidentally drew Captain Barracuda, the main villain, looking through his submarine periscope using his COVERED patched eye... and he does not have X-ray vision. The blame on this funny fact cannot fall solely on Sal, because nobody on his team caught the problem on time: inker Ernie Chan, letterer Rick Parker, or editor and scribe Len Wein. Oh well, one for the comics history books.