"The face from 2005 - 2008 was originally the same as the one seen on the Bighead and BiggerHead. It is different due to the head mesh handling images differently and originally caused a glitch where it squeezed the face" WRONG!

If a decal is on a face, then if that brick is sized, the decal will adjust it self to fit the decal size side accordingly. Meshes with a face on a side will look like... that. As well as sphere/cylinders too. Glitch Theory: DEBUNKED!

face.png

taken from MaximumADHD/Clonetroopers1019 2008 build

the UVs on the old head mesh were probably screwed up

edit: i back this up with the fact that if you replace face.png with a different image a similar thing happens