I don’t understand why Gage looked so normal after resurrection in the original movie, I imagined zombie-Gage in the novel of looking more like you’d think a three year old hit by a huge truck would look like. The last part of PS has a lot of similarities to the Exorcist, but is also kind of like a slasher flick.The last part of Pet Sematary (the novel) always reminded me of The Exorcist. But the child in Pet Sematary is much younger, I can't think of another horrorfilm that uses such a young child in a similar situation.
I get the feeling they were very careful about what they were doing with such a young child, and what they could show. He was also hit by a truck, but only has one scar on his forehead and looks normal apart from that.