My pet peeve is that you are interviewed as though you should be God, and you would be so lucky and privileged to work on this pristine, perfect codebase...only to find out that the codebase is not all that perfect, and the development processes are not scrum or agile or XP, but instead "run around like chicken with your head cut off, just get it done!"

Perhaps this is the queue for someone to suggest "that's why we try so hard to prevent bad people from getting hired". :-)