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Nintendo Player's Guide - Mario Mania 1991 - Page 32 (24 on the scan):
https://archive.org/details/Nintendo_Players_Guide_Mario_Mania_1991/page/n23/mode/2up
https://archive.org/details/Nintendo_Players_Guide_Mario_Mania_1991/page/n23/mode/2up
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After rescuing Princess Toadstool, a set of four fireworks will shoot up and explode in the sky. If you hold Up on the D-Pad just before the fourth heart-shaped firework appears and keep holding it until the credits roll, Mario's walking animation will be glitched so that he keeps switching between the poses for when he is sprinting and when he looks up.
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