Graphical Glitch in Rune Factory Frontier.

[Shonumi]

It could just be that the Dolphin revision used in that video is simply not as accurate as the original Wii hardware. Given that the video was made in 2009 (at a time when a lot of things Dolphin did was inaccurate) I'm willing to bet the developers hadn't done whatever was necessary to make the graphics look like what the Wii outputs, at least not back then.