Nitpicking (pastime)
Nitpicking is the sport of finding, often trivial, mistakes in movies and television shows. These mistakes can range from inconsistencies between episodes in a series, to plot devices and oversights, to production problems.
Nitpickers will also be inclined to find trivia in a show, including possible "inside jokes" and "signature items" added by the writers or other members of the production team.
When a recurring signature item is found in a series (such as the occurrence of the number 47 in Star Trek), nitpickers will often pore over the episodes with great diligence to find all the occurrences. While some people may view nitpicking as a form of criticism, chief nitpicker Phil Farrand "figures that even if you love somebody, you can tell them about the dab of mustard on their upper lip."