This may not be my pet peeve but it's a peeve nonetheless. I just saw a message in the vast wasteland that is Facebook from some comic book fan who was hating bigly on a long-deceased comic book artist of the past. His gripe about this artist? That he didn't always get the costumes "right" on supporting characters, especially super-villains. In Super-Marvel-DC-Team-Up-Tales #43, he didn't draw the costume on Dr. Dastardly the exact same way some other artist drew Dr. Dastardly's uniform In Ultra-DC-Marvel-Adventures-Annual #6.
There are three reasons this is a peeve for me, one being that it's usually impossible to tell who made such a mistake. Was the penciler not given adequate reference material? Did the inker misread the pencils or not fix what he or she was supposed to fix? Did no one in the office notice? Is it possible someone along the line decided they could improve Dr. Dastardly's duds and the non-match was intentional?
Second reason: Dr. Dastardly is an alien/robot/energy force of enough power to rule and/or destroy the planet. He has a super-secret lab filled with devices that can vaporize his opponents or control their minds or make them dance the Macarena against their wills. Are we to assume that he doesn't have a change of clothes? That he absolutely must be wearing the exact same thing anytime we see him?
And the final reason is a big "Who cares?" I wonder if this guy goes to 007 movies, points at any starring actor who isn't Sean Connery and yells, "The producers made a stupid mistake! That's not James Bond!"