Affects Version/s: Minecraft 1.7.2
Fix Version/s: None
Edit Just noticed that someone else has already posted about this.
I discovered that the texture for the bed wasn't reversing correctly, this meant that one side looked fine, but the other side hadn't been textured correctly.
After a little experimentation in creative mode I found this to be the same for TNT, where it's backwards. Also both doors weren't reversed in their texture for one side, meaning that it looks fine from one side, but on the other the hinge and handles are on the wrong sides.
This may have happened with other textures, but they are either less obvious, or I haven't noticed them yet.
All screenshots were taken using the in-game screenshot with HUD toggled off and the default texture.