The residents of a housing development find themselves in trouble after they discover that their development was built on top of a sacred aboriginal graveyard.
You hear the dog barking outside when it suddenly stops. When the dog's owner looks outside, she sees it's dead body floating in the pool. It's a brief scene.
You can't really see anything; a spider jumps at someone's eye and they react, the suggestion is there, but when they are shown afterward that eye is fine but their face has been severely damaged.
There is a snake in literally the last five seconds of the movie. Also, there is an eel that drags somebody underwater and kills her. It looks snake-like.