After Cathy has died Heathcliff at her grave site can't bear it and pounds his head against the nearby tree. As he runs his fingers down the tree you can see that that bark is made of perhaps rubber.
Modern vehicle visible in scene.
When Heathcliff learns of Cathy's death, he cries out in anguish. When his mouth is open, silver-colored fillings (amalgam) are visible in his back teeth. During the time period the movie was set in, this type of dental procedure was not in existence.