Trivia is the catalogue for these things such as casting choices that are interesting but don't show up in works and you can't notice them just from watching the work.
Beam Me Up, Scotty! is classed as Trivia, in fact.
Promoted Fanboy is not something that happens in a work, which is why it's classed as Trivia. Also, I don't know what you are referring to with "loads of tropes".
"For a successful technology, reality must take precedence over public relations, for Nature cannot be fooled." - Richard Feynman
Lost in Space
FYI, we have a thread for discussing which tropes should be included in the Trivia category
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Nobody has said that trivia items are not tropes. We split them out for the same reason that we split out subjective tropes and audience reactions — to maintain a sense of organization and to keep the wiki focused on the In-Universe stuff.
We identify Trivia tropes because they aren't relevant to the work taken as a singular entity without external context. While that external context may be of interest to people who care about such things, it clutters up the main trope list with stuff that distracts from the purpose of the articles.
We aren't saying that trivia is bad, just that it's a different category of thing.
"It's Occam's Shuriken! If the answer is elusive, never rule out ninjas!"
I don't understand why some entries are marked as 'Trivia'. For instance on 'The Fast Show' page there is 'Promoted Fan Boy' for Jonny Depp. If it is Trivia then loads of tropes we have is trivia! Also on The Fast Show page is a 'Beam Me Up Scotty' entry marked as Trivia. Surely in that case EVERY example of Beam Me Up, Scotty! (ie the most famous quotes are actually misquotes) is Trivia.
What would be Trivia is the fact that Depp said that Whitehouse is the finest actor he knew - this isn't a trope, even though it's related.