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In Super Mario World, one of the corners of the wall at the beginning of Chocolate Island 4 kills Mario on contact. This is the only location in the game where this occurs.
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Normally, getting hit while on Yoshi in Super Mario World will not harm Mario. However, there are three very specific exceptions: a Dino Torch's flames (not the Dino Torch itself), a Mega Mole on flat ground (not on slopes), and eating a Wiggler at high speed (safe at low speed).
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In Super Mario 64 DS, performing a Slide Kick on the Cool, Cool Mountain slide and falling off the edge will seemingly cause Mario to disappear, but actually warp him high into the air instead. Mario will float in mid-air in that pose until A is pressed, whereupon he will die.
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The long Fire Bars in Super Mario Bros. have a blind spot directly to their sides where they will not hurt Mario. Almost all of them are placed so that Mario can not stand in that spot, except for this Fire Bar at the end of Level 8-4 in Super Mario Bros.: The Lost Levels.
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In Super Mario World, the Switch Palace/Bonus Room music always includes the Yoshi drum track, even when Yoshi himself is not present. Below is a comparison between the used version and a hypothetical "Yoshi-less" version of this music with the Yoshi drum sound channel disabled.
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In Super Mario Galaxy 2, the Starshroom appears near Starship Mario after reaching Spin-Dig Galaxy. However, even before that, one of the Toad Brigade members is already present: Banktoad can be seen floating in mid-air above Starship Mario from the beginning of the game.
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