The logo of a woman on the bottles of Betty's Ergot Ale is the cursed tattoo from the episode. The woman in the tattoo is also called Betty and ergot is the poisonous hallucinogenic substance that the tattoo was made of.
The camera angles and long tracking shot backwards down the stairs are a conscious homage to a similar shot in Alfred Hitchcock's Frenzy, also with a murder happening behind the closed door.