Dead-Hand Shot: When Lansford's wife passes, we get a shot of her hand going limp as her husband witnesses her from the background and then approaches her and realizes she's indeed dead.
Double In-Law Marriage: We're introduced to Charles' older brother Peter Ingalls, and his wife Eliza Ann, who happens to be Caroline's sister. Charles' sister Polly also married Caroline's brother Henry Quiner, though they don't appear here.
House Fire: After getting into a fight with Charles, a suicidal Langsford Ingalls sets fire to his house and then locks himself in his bedroom, intending to kill himself. Charles risks his life to pull his father from the burning house.
Ill-Fated Flowerbed: After Lansford breaks his promise to tend an injured Bunny and lets Charles put her out of misery, Laura runs away devastated and when Lansford goes back to his cabin, he finds that she broke his flower pots in a rage.
Lies to Children: After Bunny is critically injured, and Charles realizes she needs to be put down, Laura begs her grandfather not to let him and Lansford, indecise between telling the truth and breaking his granddaughter's heart or giving her hope, says he can tend the horse, giving Laura a Hope Spot despite it being clear Bunny is beyond saving, only to backtrack when Charles insists that he be real with Laura.
The Lost Lenore: The death of his wife haunts Lansford so badly that he goes as far as to try killing himself by setting his own house on fire.
The Oathbreaker: The biggest source of sorrow for Lansford, after losing his wife, is the number of promises he made to her and their family and couldn't keep, such as that he'd take her to visit Charles one more time until she got ill, or that he'd make his farm prosper only to lose the land, and finally saying he could heal Laura's injured horse even though Bunny was critically injured and needed to be put down.
Charles's mother is never called by her first name Laura. Even her husband calls her "mother" during their last conversation and Caroline refers to her as grandma. It's not until we see her name "Laura Colby Ingalls" in her grave that we learn she has the same name as Laura.
Peter Ingalls has a son named James, the same name as the kid Charles would adopt in the Season 7 finale, "The Lost Ones". However, this is four seasons before James and Cassandra Cooper were introduced. Also, Caroline's sister Eliza Ann has the same first name as Almanzo's sister Eliza Jane, but the latter won't appear until Season 6.
Parents as People: Part of Charles' dilemma, after meeting his father again, is coming to terms with the fact that he's a troubled man, depressed and frustrated with what he didn't accomplish and strained from his children, even the one who lives near him, Peter, who wants nothing to do with him anymore.
