I don’t view it as playing it safe- I view it as being authentic to one’s own self. As Soozie pointed out- every kid doesn’t have something relevant or additive or helpful to put in the Additional Information section. So don’t put it in. Some kids have something to add- that’s where it goes.
You don’t need to concoct something polarizing or irritating or shocking just for the sake of standing out. I had a candidate for a role at my company a few years ago who did something “so he’d stand out” which resulted in security being called and a restraining order being issued.
One person’s joke is another person’s “If you see something, say something”. There are enough obnoxious people in the world- a nice kid doesn’t have to go out of his/her way to go big or go home, even if that means “forfeiting” their Stanford golden ticket.