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In Super Mario 64, the surfaces Mario can run up at a steep angle, such as the pillars in Shifting Sand Land, do not interact properly with Mario's crawling animation. If the Control Stick is pushed in different directlions while crawling, Mario's model will flail around wildly.
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Super Mario 64 contains unused code for throwing MIPS the rabbit, including a unique animation of him falling onto the floor and getting back up. In the finished version of the game, this was replaced by Mario carefully setting MIPS down instead of throwing him.
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The first segment of the new Snow theme music in the Super Mario Bros. 3 game style of Super Mario Maker 2 is synced up with the Warp Pipe sound effect and the sub-area loading time. If Mario enters a Warp Pipe in time with the music, he will also exit it in time with the music.
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In World 7-2 of Super Mario Bros.: The Lost Levels, if Mario is hurt by this Fire Bar, the red Koopa Troopa on the nearby platform will turn around and start walking backwards.
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In Mario Kart 8/Deluxe, a melody can be heard faintly near the Aqua Cups ride on the Water Park track. This is actually the Merry-Go-Round music from Big Boo's Haunt in Super Mario 64. An isolated version of the music, extracted from the game, is provided after the footage.
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In Super Mario 3D World, repeatedly hitting Bowser's broken car has a small chance of playing a random Super Mario World sound effect. Due to the low chance and the high number of possible sound effects, it is unlikely that any player has ever heard them all. Details in video.
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In the files of Hotel Mario, audio for a tutorial narrated by Mario can be found. However, Mario is not voiced by his voice actor from the final version of the game, but by a monotone voice likely belonging to one of the developers and intended as a placeholder.
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When creating the Skeeter enemy in Super Mario 64, the designers overlooked that the game's mechanics make a water surface-based enemy completely ineffectual. Since Mario automatically recovers health on water surfaces, all damage dealt by a Skeeter is immediately undone.
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