The woman who greets Daisy in the bathroom mid-performance is actor Deanna Dunagan, a Tony-winner for August, Osage County. She is credited as "Tony-Winner Deanna Dunagan."
The title of this movie, "Ghostlight," refers to a theatrical tradition that calls for a single bulb to remain lit on a stage even when the rest of the theater is literally (and figuratively) dark. The origins of this tradition are unknown; it may have emerged from basic safety concerns, but since theater has numerous superstitions, many of obscure origins, it may be only or primarily a symbol for luck. Some members of the general public were first introduced to this tradition when theaters worldwide were forced to close during the COVID-19 pandemic and there were several articles published and news pieces produced about theaters keeping or reinstating the ghost light tradition until performances could resume; for example, a CBS news piece about the Broadway shutdown was titled "Ghost Light: The Year Broadway Went Dark."
Keith Kupferer's Dan may be based on the actor's character in the 2006 Will Ferrell comedy Stranger Than Fiction: "Demolition Foreman."
The song "That's Enough" that Sharon's elementary school class sings in the film's opening half hour was written by the musician Sad Brad Smith, the stage name of actor Bradley Grant Smith. Smith was cast in Alex Thompson's thesis film, as well as two roles in Saint Frances and a supporting role in Thompson's Rounding. He lives on Nantucket Island.
The prop dagger used for Juliet's death scene is a plastic retractable dagger that producer Ian Keiser purchased off Amazon before preproduction began.