the rendering of all mobs and players is glitched

sorry, it wouldn't let me chose inf-20100618 - beta 1.7.3

Put the summary of the bug you're having here

What I expected to happen was...:
the game to run like normal and how it was back then

What actually happened was...:
when I spawned in a world, every mob and player looked glitched

Steps to Reproduce:
1. start a minecraft version betwen inf-20100618 and beta 1.7.3 in the new lanucher.
2. start a new world or join a server running it's version.
3. see all the mobs and players be very glitched up.