My experience was similar.
I'm surprised that none of the cereal brands have thought to make use of all that carton space. Bits of educational stuff, Ripley's Believe It Or Not. The 'times' tables. Even the alphabet!
I remember in 'Cheaper by the Dozen' that the father posted stuff on the walls, like the Morse Code signals. The intent was not to 'study' them, but that just by repetition, it would sink in.
I learned French off the ingredients listing on Canadian cereal boxes - easy to figure out once you realise that the ingredients were in the same order in either language.
Braille, sign language, world facts. Names of the presidents, or kings, or states, or oceans.
Actually, the cereal I buy - usually house brand - often has vaguely educational stuff on the back of the box: simple history and geography, etc. Sometimes the name brand cereal has it, too, though they're more prone to silly games or promotional junk.
On the reading tangent, my sister was a few years ahead of me; she'd come home from school, set up the toy blackboard, and show me what she learned that day. So, IIRC, I was reading, at least basic reading, when I entered kindergarten.
Also on the US dollar coins, the late and lamented Sacajawea dollars, last I checked I could still get them from the dispenser at Brown Bear car wash, where they work the same as the brass tokens at the vacuum and self-serve car wash bays. American habits were just too engrained to accept a dollar-equivalent coin like so much of the world uses, unfortunately.
And I'm constantly amazed at how people don't seem to know stuff that most of us theoretically learned to get through grade school. "Fifty Nifty United States" - did nobody else sing that one? Did nobody else have to copy the map? Gah...