An editorial Goof. The Marvel Bullpen gave comic fans a "No prize" whenever they would solve a problem or a mix up in one of the Marvel Comics, so that it wouldnt seem that the writer/artist had made a mistake.
In tribute to this long legacy, Marvel Comics published the No-Prize Book in 1983, in witch the biggest mistakes made in Marvel Comics up until then where published.
Think of, the X-men Angel calling his friend "Angel" , wrong colors on hero's, goofy sayings (some of them even racist by today's standards) or misspelled names on the same page.
