His head looked disfigured because his hair was under the plastic.
Was it really? I thought something looked off. I guess he had to weigh shooting a couple scenes vs shaving the head.
It looked like it did when he played Walter on SNL
They used a bald cap. Likely because he was in the middle of another production that wouldn't allow him to go bald.
It was really obvious as well. That, and Todd's weight were a bit distracting. Not the end of the world though.