At the end when Patrick is holding the picture of Pearl and Jimmy, he has long red painted fingernails - these are obviously not his hands.
In the jump-rope rhyme it says of Jimmy Bones that "he has a switchblade loose and a diamond on his hand". The only knife Jimmy Bones is shown to carry is a Butterfly Knife, not a switchblade.
Near the climax, when Patrick's "father" has hold of his arm, he is shouting "Jimmy Bones did this, Patrick," but his mouth is not moving.