1. Hulk was originally grey when he was introduced, but became green to compensate for poor color separations used to print comics in the '60s.

2. Stan Lee put a hyphen in Spider-Man's name so it would look different from Superman in print.

3. Marvel Comics and DC Comics have co-owned the trademark for the phrase "super hero" since 1981. They pursued this action because the toy company Mego, which made licensed toys of DC characters, had beat them to it. Mego gave up the trademark when the two companies threatened legal action.

4. Wolverine was originally intended to be a genetically mutated wolverine rather than a human mutant. Stan Lee himself vetoed the idea.

5. Marvel had a rule in the mid-'70s that Wolverine did not have arm hair while in costume, but could have arm hair when he was in regular clothing.

6. Marvel published the first issue of their adaptation of Star Wars in March 1977 with a July cover date, about two months before the movie was released in theaters.