Most noticably, Afro's 'fro was neon green. It's still got a greenish tint if you look real close, but nowhere near as green as it was; this is referenced in the first part of the first film.
After the extent of Michael's mechanization is shown, and considering how long it took to reveal him, he got cut down pretty easily. A storyboard in the art booklet that comes with the director's cut of Resurrection shows what appears to be Michael using his chains to fling himself at Afro, even though he's somewhat stationary in the movie. It can be inferred that the creators originally intended to make Michael more mobile and lethal, but for whatever reason, didn't.