The Originals - Easter Eggs & Hidden Details

In a Legacies episode, Hope wears a stunning blue ballgown to the Miss Mystic Falls pageant. Lizzie Saltzman reveals the dress was a gift to her mother, Caroline, from Klaus Mikaelson. This is a direct callback to "The Vampire Diaries" Season 3, where Klaus gave Caroline the same dress to wear to his family's ball, a key moment in their popular romance.

During a brief visit to Mystic Falls in Season 5, a portrait of Katherine Pierce from the 1800s is visible in a display case at the Salvatore Boarding School, a direct reference to the iconic villain and doppelgänger from "The Vampire Diaries."

The excuse of a "gas leak" to clear humans out of a supernatural hot spot was a running gag in "The Vampire Diaries." "The Originals" adopted this, frequently using the same excuse to close down St. Anne's Church when witch-related activities were taking place inside.

In one scene, Kol Mikaelson greets Klaus with the line "Hello, brother." This is an iconic line from "The Vampire Diaries," famously used by Damon Salvatore as his standard, often sarcastic, greeting to his brother Stefan.

After the Harvest Girls are resurrected, the witch Genevieve mentions the collapse of "The Other Side," the supernatural purgatory for ghosts. This was a major, catastrophic plot point in Season 5 of "The Vampire Diaries," directly linking the timelines and consequences of events between the two shows.