suppermariobroth:

Credits animation for completing Level 20 on the High speed setting in Dr. Luigi for the Wii U. Note that the animation is a perfect 96-frame loop for all characters present; while this is common for 2D sprite-based games, it is rare for a scene with multiple 3D entities to have each of their movements loop in the exact same number of frames outside of rhythm games.
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suppermariobroth:

Top: the Japanese and US versions of Super Mario Bros. have a one-block gap above the pipe leading out of the water in Worlds 2-2 and 7-2. If Mario is in Super or Fire form, it is very easy to get stuck in the wall by ducking on the ground and then swimming into the gap. Mario will get sucked into the rocks and be unable to escape, with the only option being to wait until the time runs out to restart the level.

Bottom: in the European release, Nintendo has corrected the error in the simplest way possible. Rather than patch out the glitch that results in Mario being sucked into the wall (it can still be performed in other places in that version), the developers simply added a block to close the gap.
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| Twitter | Patreon | Store | Source: myself, Super Mario Bros. (US and EU) in NES emulator