Here is the definition of trivia in the own trivia page:
"Trivia pages are attached to the work they are about, on the Trivia tab. They are for on-topic information, fun facts that are not really storytelling tropes (unless they happen In-Universe).
Trivia falls into classifications — that is to say, little bundles of similar facts. The bundles are listed on the wiki because they are sort of fun. If you find an example from one of the following little bundles, it goes on the Trivia tab of the work, not its storytelling (main) trope examples list.
You can also add Trivia items that don't fit any category or premade page as long as it is legitimately trivia, and not a trope or an Audience Reaction."