Train Dummy Mishap: In a season 5 scene, a dummy is clearly visible being tossed from a train instead of a real person, breaking the illusion. Tension on Set: Melissa Sue Anderson (Mary) was seen as aloof by castmates, while Alison Arngrim (Nellie) and Melissa Gilbert (Laura) became real-life best friends. Heartbreaking “My Ellen” Episode: In this emotionally charged episode,...