Here's our current definition of the off-topic reason "trivia" from the "What topics can I ask about here?" help page:
Unimportant trivia that does not add to the understanding or appreciation of the title.
This definition is not very useful as what one person's feeling on whether it "adds to the understanding or appreciation" could vastly differ from another's. Clearly, if someone asked the question, they care about the topic, so it must be "important" to them in some way.
Additionally, not all of our questions are about "a title"... we have many questions that don't relate to a specific film or TV show.