In Super Mario World, when Mario is riding Yoshi, almost everything that would damage Mario knocks him off Yoshi instead. Mega Moles are one of the very few objects that ignore this rule and still hurt Mario.
The Super Mario Bros. 3 title screen contains a subtle reference to Super Mario Bros. in the palette of the “3″ in the logo. The number cycles through the exact same colors that the Question Blocks in Super Mario Bros. cycle through. Note that the Question Blocks in Super Mario Bros. 3 itself do not use this palette, so the reference is likely to have been deliberate.
Only Seven Acres of Rose of Pollux's Musings & Daydreams 