In certain areas of a world (most notably spruce forests) there is a texture glitch that causes leaves to turn red, instead of their usual green. I am on the default texture pack and this is affecting old worlds from before I reinstalled the game (I copy pasted the world files to my desktop as a failsafe before uninstalling minecraft to make sure I had backups. I then copy pasted them back into the worlds folder), and new worlds. There appears to be a noticeable line where the glitch affects the leaf textures, and beyond this point the leaves have the correct texture. It only seems to affect spruce forests and once outside of the spruce forest biome's borders, the leaves have their proper textures. I have yet to notice any other texture based glitches.