Jonathan pours a glass of juice to a depth of about two inches. In subsequent shots it's filled to near the brim.
The consumer of milk in the refrigerator is obviously just an empty prop.
There are obvious stunt doubles for Wagner and Harris in the fight in the kitchen.
When Jonathan leaves his hospital room to call Jennifer, he feels the door number. He traces the numbers as though he can see them, when his eyes are bandaged shut.
A second door to the Harts' bedroom has been used before, but the bad guy is only seen tying one shut.
When Freeway comes to greet Jonathan, home from hospital, he's heard to be barking, but the dog itself isn't.
Dr. Morse is presumably murdered by Arnold, but no-one ever questions where she is.
Jonathan says that the bandages can removed in 48 hours, yet later that day he says that he can remove them the next day.