After MGM acquired the show from Paramount, the crew tore up old sets that were used for MGM productions to make room for the new sets that were needed for the show. When Michael Landon removed flooring from one of the old sets, he uncovered the Yellow Brick Road from The Wizard of Oz (1939), which was still intact. Melissa Gilbert and the other kids got extremely excited when they recognised it.
While working on an episode of the show, Garett Brown, inventor of the Steadicam, chatted with former NFL player Merlin Olsen between scenes. Olsen mentioned how limited he thought television coverage of football was, because the static cameras couldn't give the audience any sense of the speed and flow of the game. With that in mind, Brown eventually designed what he called Skycam, (now also known as Cablecam or Spidercam) the floating hydraulic camera system that flies around the stadium above the players, with a 360 degree viewing angle. It has since become an essential tool in the coverage of live sporting and stadium events.
Karen Grassle (Ma/Caroline Ingalls) has talked in interviews about Michael Landon's decision to blow up the Walnut Grove set as a spiteful show of protest against NBC; who decided to cancel the show. She has said Landon's blowing up the set was very "sad"; and she "wishes he hadn't done that."
According to Allison Arngrim (Nellie)'s autobiography "Confessions of a Prairie Bitch," Katherine 'Scottie' McGregor (Harriet Oleson) was a nice lady, but also a disruptive element on the set. She would always give other actors and actresses direction. Even onscreen husband Richard Bull (Nells Oleson), who had to put his foot down when this happened. She would also argue with the directors. Eventually, Michael Landon seriously considered firing her, but her performance as the show's villain was just too perfect to let her go, so he tolerated it, and McGregor stayed on as the villain for the run of the show.