Near the end of the episode there is a shot of the Mrs. Sullivan Restaurant that has the "Grand Opening" sign from earlier in the episode but in the previous scene when Harriet is handing out the coupons, and a few earlier scenes, there are other signs on the front of the restaurant. The shot is reused from earlier in the episode.
When Charles is massaging Caroline's feet, she tells him that they took in almost $25. How would Caroline know that? She had just left when Harriet tells Nels the total.
Albert and James would not have dumped uneaten food in a bin outside. It would've attracted every bear, raccoon, rat, coyote and wolf around. It was usually burned, buried or used to slop hogs and barn cats.
The scene at 34 min mark with Ingalls' chickens walking out of the coop is from an earlier season. Bandit's doghouse is missing from the yard.
At the end of the episode, Mrs. Oleson is approached by a man looking like Colonel Sanders of KFC fame, asking her if she would like to serve only fried chicken at her restaurant. As the show took a lot of liberties with characters, it was the case here. Colonel Harland Sanders was not born until 1890, and didn't start his first Kentucky Fried Chicken franchise until 1952.
The phrase "wave of the future" was not used until 1940, based on an essay by Anne Morrow Lindbergh.
It seems very odd that Mrs Oleson would not read a contract before she signed it given that she is such an experienced and astute business woman.
No policy on planet earth could EVER have made Caroline work on Sunday.
Previously Caroline Ingalls was given 50% of the profits from the restaurant because no one would eat Nellie's cooking. She's obviously been shafted in this new franchise deal.
Harriet's problem of not having enough help to run the restaurant, especially when it went to a 24 hour operation, could easily have been solved by simply hiring more staff.
No mention is made of the other Dr's wife Mattie who was supposedly working as hotel staff also.
It would have been bad form for Mrs Oleson to demand Hester Sue ignore paying customers like that in front of a business associate she was trying to impress.