Alison Arngrim passed out once from heat exhaustion
The actress who played the super-annoying Nellie Oleson once took a dive from exhaustion. The problem was the costumes, which were traditional 1800s clothing. They filmed much of the show in Simi Valley, California, on a ranch. Some days the temperatures would exceed 90 degrees. Arngrim wasn’t alone. Once an assistant director also passed out from heat.