In Paper Mario: The Origami King, it is possible for Mario to accidentally lock himself in a fridge forever.
If, during the investigation portion of Overlook Tower, Mario opens the doors of the fridge in the restaurant kitchen and jumps inside before the doors close, there will be no way for him to get back out as the door interaction prompt does not appear while Mario is inside.
Note Mario's silhouette inside the fridge, attempting fruitlessly to escape. The only way to continue playing is to reset the game.
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In Paper Mario: The Origami King, the Princess Peach cruise ship contains six framed pictures of Peach, with five being faded and each referencing a previous game in the series, and one being in full color and depicting Peach in a location from Paper Mario: The Origami King itself. Here are all the images, extracted from the game's files.
Top: the five images referencing previous games, each listed with the game it is a reference to. Some references are subtle; for example, the Paper Mario: Color Splash Peach design is identical to the one used in Paper Mario: The Origami King, but the blurry background behind her actually depicts a staircase from Port Prisma in that game.
Bottom: the final image, referencing Paper Mario: The Origami King.
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