I'll explain what I mean:
I'm rereading Claremont's run on X Men. Currently I'm on issue 109, and there's a point where Colossus says that Nightcrawler looks like Chewbacca from Star Wars. Kind of weird considering that the two share no resemblance whatsoever, but I assumed it was just a pretty lame joke from the humorless Colossus.
But then a few pages later when Nightcrawler is talking to Cyclops, he says "I've only been blue and furry since I was born?" Then it struck me, was Nightcrawler supposed to have hair all over his body and it just never caught on?
Back before the advent of digital coloring, dark blue was used to indicate hair.