I like seeing ponies writing with their hands and not teeth for a change. In G3 and Tales, the ponies had retractable bumps on their hooves called "Hoof Nubs". Seeing as it was used by the Tales ponies, it's likely to be a physical feature exclusive to Earth Ponies and Alicorns.
I remember thinking I was being sneaky by looking up at the big timestable charts at the front of the class during math tests. The 7 and 8 times table charts always fell down though, so those always screwed me up. To this day, multiplication by 7 or 8 is the hardest for me to do in my head.