The Legend of Zelda: Twilight Princess HD
The Legend of Zelda: Twilight Princess HD
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In the original game, the mural in Hyrule Castle Town was blurry and hard to make out. In the HD remaster, the textures were updated with clearer, brand new designs. Notably, this mural features a Rito, a species which does not exist at the time the game takes place nor in the series' Child Timeline.

Separately, in the Temple of Time, a picture frame can be found with a backwards message written in Hylian along the lower border. Translating it reveals a hidden developer credit: "Jack Kirby Crosby Made This".

Crosby, a graphics designer working for Tantalus on the HD remaster of Twilight Princess, later confirmed that he was responsible for both that credit and the mural, the latter of which was the result of a higher-up at Nintendo asking for some reliefs in Hyrule Castle Town to be redone in the same style as a shop he had re-textured. The new mural design was inspired by Crosby's own idea of a story for a Zelda game and drew additional inspiration from a Zelda art book without any story direction from Nintendo, meaning the events depicted therein are non-canon.
Contributed by MehDeletingLater
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Inside the store Chudley's Fine Goods and Fancy Trinkets Emporium in Hyrule Castle Town, you can find two pictures from The Legend of Zelda: Breath of the Wild, featuring Link on Epona in Hyrule Field, and the other of the grove where Link fights the spider enemy, plus two smaller versions of both.
Contributed by KnowledgeBase