When Mary (Melissa Gilbert) is swimming out of the lake she has bare feet and legs but when she gets to the bank she is wearing stockings and boots.
When Laura asks Charles how old widow Sanderson is, he responds that she is about 30 or 40, when anyone can clearly see she is pushing 50.
The funeral sequence takes place in continuous torrential rain but it was very clearly shot on a day of cloudless blue skies and blazing sunshine, despite efforts to hide it with tight framing and not showing the sky.
Charles tells Mrs. Sanderson that her husband did many favors for him over the years, but this is impossible as the Ingalls family has only been in town for a year a little over a year.
When Mrs. Sanderson ask Charles about Caroline, she calls her Karen, the actress's real name.
Mary retrieves wet puppies from the sack where they were almost drowned in. She place 3 of them on her lap. She reaches for the "last one", then hugs Laura tightly. The puppies would have been crushed.