Edwards places two boards across the well hole. When Willie steps down there's only one board covering the hole.
Nels Oleson supposedly fixed the icehouse door to open from the inside on a previous show when someone got locked in.
Ice blocks in icehouses were always covered with sawdust or straw for insulation. The ice in Walnut Grove is not.
Mrs. Oleson claims to have never seen a midget before, but a few years earlier a circus came to Walnut Grove that had a midget in its company. In fact, that midget was also played by Billy Barty who played the midget in this story.
When Anderson and Lou begin discussing his employment history, Katherine MacGregor's shadow is visible on the bush outside of the door way, as she waits for her cue to go in.
At 29:12, Harriet Oleson is shown putting salt or pepper in the pot she's cooking in. The camera switches angles and the shaker is back up on top the stove and she has the spoon in her hand.
When Harriet is in the diner kitchen, she sets a large white bowl down twice on the stove next to the stew pot.
When bringing Lou to the well hole there's a modern nut/bolt driven into the wood brace.
The men's' pants are seen to have belt loops, but belt loops were not invented until 1922.