Bill Munns' makeup designs.
-The Tarman suit was pretty good made better by Kenny Myers' animatronic mask and Allan Trautman's performance.
-The skeleton coming out of the ground looked way too clean (but still cool).
-The background zombies had awful masks and they ended up not using them.
-The original "Yellow Man" design defies logic and has to be seen to be believed.
I think Munns was hired because one of the producers owed him a favor. He's talented, but didn't quite know what he was getting into with this project.