Call it my ignorance of never watching the show, but the following "How I Met Your Mother" questions seem more like trivia/off-topic for our site when compared to similar questions regarding other series:
- Why doesn't Barney wear the Duckie Tie?
- https://movies.stackexchange.com/questions/9769/which-are-the-facts-we-know-so-far-about-teds-wife-of-himym (List question)
- How did the Slap Bet count develop?
- What do we know of Barney's occupation? (List question.)
- In "How I Met Your Mother", who is Barney married to?
If someone can clear up why they are good examples of questions about the series (again, it could just be my ignorance why these questions are important), then they are safe. Otherwise, they're in my radar to close (and one has already met this fate).