Here’s my contribution:
This chronicler of the old Perry Mason series, in perpetural reruns, went to the trouble to study every picture of his office set over 9 years of episodes.
Every one of the hundreds of episode. Every time someone entered or left.
The main reason seemed to be that some years the set changed slightly, with pictures moved left or right, and jutting corners sometimes shifted slightly.
After years of study, the main floorplan emerged.
Wikipedia attracts a lot of fan articles. People write articles for series; then they write articles for regular characters and individual episodes; then they start writing articles about minor characters who appeared once or running jokes in the show or lists of who’s appeared as a guest star. But the one that I figured was the epitome of fancruft was the article one guy started on the subject of Chandler and Joey’s entertainment center. Which even if you’re a big fan of Friends, you’ll have to agree was not a major theme in the show. And the guy got incredibly indignant and swore at us when we voted to delete it.