Paper Mario: The Thousand-Year Door

Paper Mario: The Thousand-Year Door, released in Japan as Paper Mario RPG, is a console role-playing game developed by Intelligent Systems and published by Nintendo for the Nintendo GameCube. The Thousand-Year Door is the fourth game in the Mario RPG series and the second in the Paper Mario series.

Professor Frankly's Gate
The gate outside Professor Frankly's house turns into a cyan block, and then disappears when he is opening it to show you the Thousand-Year Door.

Punies
The Punies may display incorrectly on all backends. EFB to Texture displays garbage, while EFB to Ram shows the Punies but distorts them. It only happens when they are standing still, and seems to happen more when they are facing left and not right. See. There is a workaround is using a custom texture to replace the garbage...

Cache Display Lists
Enabling Cache Display Lists causes bounding box glitches.

Background During Pageflip
In the castle in Chapter 1, and there's this switch puzzle where Koops are used to hit a block. Walls become improperly transparent behind where the stairs move to. Refer. Fixed in.

Improper Water Effect
After Stone Key Quiz and going through a pipe into the sewers, the water reflections are a bit messed up depending on where you walked. Refer. Fixed in.

Chapter 3 Posters
In Chapter 3, when you peel the posters off the walls, they show up improperly and look weird, sometimes casting blackness over the wall, sometimes showing up as a tiny piece of a poster, and sometimes drawing over geometry they shouldn't be. Refer. Fixed in.