Odd texture bug with quality change?

Before updating Unity, scenes would render without any issue. Even now it displays fine, unless I were to change the quality in-game. Several materials will begin to display incorrectly, most of the time displaying one from another game object.

To give an example of what I mean I've made a video cutting straight to the point. It's one of my lesser bug-ridden scenes, but it's important to note that the issue still exists and is more than just slightly distracting.

http://goo.gl/myoSxs

Is there anyone that knows why this happens and that can explain what I should do (or not do) to avoid this problem in the future?