For a PG-13 film, The Skeleton Key is very vicious and violent, more so than such other modern PG-13 ghost films as "The Apparition" or "The Eye"
People are beaten, thrown around, slammed into things, and choked. Bones are broken, but most of this happens with minimal blood.
A woman goes into a dark attic room where she finds jars of what looks like organs, a monkey head, and a human head with eyes and mouth stitched shut; she drops a jar on the floor and it breaks -- it contained a skin sack stitched up with something inside it.
A woman is seen in a dream with her eyes and mouth stitched up.
A character finds a man pulling himself along a roof (He is partially paralyzed) the man falls from the roof onto the ground below (he is not seriously injured).
A persons broken legs have large lumps under the skin and gaping wounds. This character drags themselves around and this is very disturbing.
A woman cuts her hand with a knife and smears the blood onto the floor around her.
A woman cuts the legs and head off a dead chicken.
We see alligator heads with sharp teeth in their mouths, and bones dangling from strings.
A floor standing mirror falls onto a person knocking them to the ground.
A woman drives her car into a locked gate, she tries to ram it in order to open it and crashes into a birdbath.
We hear about a man abusing "his help."