Stay Puft Scene Before and After 

So stay puft if you look closely during his scenes at times is actually semi-transparent. Using box blur and some masking solves it mostly. As you may notice the buildings dance around due to bad compositing. Used stabilize in after fx and some masking to keep them from moving too much, took me hours to fix that shot, still need to get rid of that bit under stay puft's foot. But it looks a lot better now. Very sloppy fx, how they couldn't keep the matte painting still is beyond my understanding. Will indeed be having the church exhibit some signs of damage when staypuft steps on it so stay tuned for that...