Put the summary of the bug you're having here
What I expected to happen was...:
The oak door texture in inventory and creative menu to be normal.
What actually happened was...:
The oak door in inventory and creative menu has an extra pixel in bottom-left corner of bottom-right window.
Steps to Reproduce:
1. Open Minecraft 1.8.1 prerelease 4
2. Look at oak door in inventory or creative menu
3. Fix it, as I am OCD.
Cannot confirm the "extra pixel". Either the door handle is confusing you, or you're using a resource pack that's overwriting the texture.