Previously the Ingalls' loft had girls and boys separated by a hanging blanket partition. But in this show Cassandra is right next to James and Albert.
Just before James and Cassandra come home from speaking with their Uncle Jed, there is a scene in which Carrie and Grace are colouring with what looks like crayons. Crayons were not invented until 1903, 20 or so years after the appropriate date of this episode.
As Jed is walking with Charles and Caroline to talk about the children, you can see a boom mic at the bottom of the screen as they come to a stop.