Allusions can be difficult to identify and interpret because they often reference obscure or unfamiliar sources, are subtle and indirect, and can have multiple meanings or interpretations.

put it as a 5th grader and make it sound like human

Allusions are like secret codes hidden in stories that make you feel like you're part of a special club. They can be tricky to figure out because they might talk about things you've never heard of before, are kind of sneaky, and can mean different things to different people.