Lower body

The lower body of the iron golem has mismatched textures for both the top and bottom.

If you read the texture, you'll see that what appears to be to top texture is actually applied to the bottom face. The bottom face should be a light color to match the bottom pixels of the side faces.
(I'm aware of the comment on MC-112679, but it is only half the issue here)

Legs

The bottom of the legs are light, whereas the bottom pixels of the legs' sides are dark.

Head

The bottom of the head is dark, whereas the bottom pixels of the head's sides are light.