Okay, I thought of another one, and it is exclusive to a certain group of people. Hang with me here for a minute and allow me to explain.
We are from Louisiana, land of Mardi Gras. The first time we took the kids, they could not figure out for the life of themselves why Mickey did not throw them beads during parades.

I have pictures of them with their little hands in the air, waving in vain and yelling at Mickey to throw something. Bless their little hearts.
So, while adults may realize there will be no beads and throws to catch, Louisiana kids experiencing Disney parades for the first time may not. Prepare them accordingly. There ya go!