When Ricky is in the kitchen having breakfast, there is a pair of sunglasses on the counter. When Howard Duff enters the kitchen, the sunglasses are gone.
Ricky says his sunglasses are prescription, however Ricky doesn't wear glasses, so there would be no reason for him to wear prescription sunglasses.
When the rowboat starts leaking, the water shoots up well over the top of the boat. In reality, the water would only rise to the same level as outside the boat; the bottom of the boat would just slowly fill with water.