Chic and Mrs. Cooper are playing Clue- a game about a murder mystery. As of this episode, there have been three murder mysteries in the series.
This episode is titled after the Edgar Allan Poe short story "The Tell-Tale Heart" first published in 1843. It has thus far been adapted into 5 movies, in 1939, 1947, 1960, 1989, and 2016.
There are no lenses in Veronica's glasses.