In Super Mario World, using Yoshi to jump to the platform with the key and keyhole in Donut Plains-1 in the manner depicted will result in the camera not scrolling upward to keep up with Mario. When the key is then inserted into the keyhole, the keyhole animation plays in the wrong position in the level.
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Mario and Yoshi using a ghost costume to scare Larry Koopa in the Japanese “Super Mario Wisdom Games Picture Book 4: Larry’s Mischief”.
The demo shown on the start screen of Super Mario World (1991) takes place in Groovy, the fifth level in the Special World.
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.
From Super Mario Picture Book: Chaos at the Amusement Park
Only Seven Acres of Rose of Pollux's Musings & Daydreams 