Quote from samohtj
The zombie texture didn't really change that much. Go into your image editor, and change the canvas size to 64x64, instead of 32x64. Every image editor has a way to change the canvas size, it shouldn't be too hard to find.
For future reference, all the default textures are in your <version>.jar, in /.minecraft/versions/<version number>.
That was also part of the problem too. Thanks a bunch as well!