Continuity mistake: The restaurant has "Caroline's" painted on the windows (except while operating as Mrs. Sullivan's). However, near the start of the episode, when the horses trot by in a nighttime exterior shot of the restaurant, the window still reads "Nellie's" (taken from earlier in the series). This same mistake has been seen in at least one other episode of season 8 as well.
Continuity mistake: When Laura pushes Mrs. Pierce, she lands in a pail of water on her buttocks, and her hair remains dry. The next shot is of Laura saying something, then in the very next shot we see Mrs. Pierce still sitting in the bucket, only now her hair is soaked. Since she landed on her behind, her hair should not have been soaked, and there was no time for anyone to pour water on her head between the shots.
A Christmas They Never Forgot - S8-E11
Continuity mistake: Every time they go outside during the blizzard, the keep talking about taking in wood, but yet the wood pile never changes throughout the whole show.
He Was Only Twelve (2) - S8-E22
Continuity mistake: After James is shot, Charles takes James away from the house because his family is getting upset. He builds an altar. A ladder is on the side where the shelter is. The ladder is gone in subsequent shots.