Fun Fact: I Know What You Did Last Summer's Alison and Lennon Aren't Actually Twins in Real Life

While Lennon and Alison were played by the same person, Iseman used a body double for scenes where her characters were facing each other or to properly figure out where to maintain eye contact, Iseman told Variety. The scene where Lennon's body rises from the ocean where she was tossed after her death was the only time they used face replacement on her body double. Typically, Iseman said she would film in one character for the first half of the day and then switch to the other, but in special circumstances, she went back and forth.