Cousin Ben Wellington, who dies at the beginning of this episode, appears in the internet show Harper's Globe. At the beginning of the episode it is revealed that Harper's Island is 37 miles off the coast of Seattle, Washington and is only accessible by watercraft. The title of this episode, which is Whap, refers to the sound made during Cousin Ben's dismemberment by the ship's propeller. All 13 episode titles refer to sounds made by the deathblows of various weapons used in that episode
At the end of the first episode Abby finds a newspaper article featuring a photo of her mother taped to her bathroom mirror. Because the part of her mother had not been cast at that time the photo had to be added digitally in post production.