It was impossible to have decent pictures so I recorded two videos and made some screenshots of the exact frame. Then I noticed more wrong textures than I first spotted. I tried to add them all in the composition. Basically bikes, stop signs, trucks, footbridge and skybox. Also the bus wheel and some banners, although that could be missing geometry instead of texture corruption.
Emulator is on SD card and games on USB. On the left side pics are from the boot_31b1d1e build and on the right side pics are from the boot_logfix.
Interestly, if I load the game from the SD card in all builds these graphic issues are gone. But it seems performance is a little worse. At least there are longer stutters than didn't happen loading the game from the USB.
I wonder if someone else is having this same issue or if my configuration (Wii/HDD) is too special. In io-Quake a few more users also reported what was happening to me.
Looking at another topic that someone else started, my System Menu is 4.0E. I wonder if that's related. Or maybe bootmii as boot2 is taking a little more memory that if it wasn't there as I think the most common thing is not beeing able to have it.