Fridge Logic: Almanzo tells Laura that his sister, who's been the schoolteacher for several months, often spoke of her. Eliza Jane Wilder hated Laura, believing her to be the one instigating all the bad behavior in the other children, so odds were she wasn't saying anything terribly complimentary. So what does Almanzo go and do? Start courting her, even if Laura didn't figure it out right away. It leaves one wondering just what Eliza Jane actually said, and how much it might have contributed to her brother's decision to court Laura, who was at the time only fifteen.
Fridge Brilliance: Sibling rivalry. Farmer Boy shows that Almanzo and Eliza Jane didn't really get along, and the years probably didn't improve on that much. He could have started meeting Laura just to antagonize Eliza Jane, and then genuinely fell in love with Laura.
Considering that Almanzo's comment comes after a whole string of incidents including the seat-rocking episode described on the Crowning Moment of Awesome tab, he may even have been able to see through Eliza Jane's dislike enough to be impressed by Laura's sheer audacity.
Fridge Brilliance: In The Last Farewell, the townspeople leave but one building intact- their church. Their body. Yet, even though they deliberately left the church intact because they couldn't bring themselves to demolish it, it still got damaged in the explosive bedlam and all too accurately and symbolically represented how the townspeople had become a damaged, wounded body of Christ that still stood firm.
Fridge Horror: Do NOT get Laura angry with you. Cases in point? She refuses to pray for her brother. He drops dead. Then her son drops dead years later. She complains about having to take care of Jack (their dog). He drops dead. She gets into a romantic rivalry with her sister, Mary, over a neighborhood boy. The neighbor boy prefers Mary. Mary goes blind. Laura has a violent, tearful meltdown after a land baron threatens to turn Walnut Grove into a company town and steal their property out from under them. Laura takes it out on her own house, which she got from a widow as a gift. Everyone else takes a page from her meltdown and decides to destroy the buildings Nathan Lassiter covets so badly. The entire freaking town gets blown up.
Ben Woodworth's father came to North Dakota to take the "prairie cure" for his tuberculosis, and seems to have recovered. There wouldn't be an actual cure until the 1950's, and tuberculosis is extremely contagious, so who knows how many people he managed to infect without realizing it.
When Alice Garvey and Adam Kendall, Jr. are killed in the fire that destroys the first blind school, it was because Albert and a friend were messing around with a smoking pipe and forgot it in a pile of flammable cloth while trying to avoid punishment. Shortly afterward, Albert goes into a tailspin of grief and runs away to his estranged birth father's residence out of desperation to avoid his guilt toward his friends and adoptive family, only to find a freshly-dug grave. Near the end of the series, Albert himself is revealed to have leukemia and is just now showing signs of succumbing to it after spending his life up till then unharmed. Perhaps divine punishment saw fit to claim the years from Albert and his father that Alice and Adam Jr. never got to live. Albert's dad had to pay for Alice's years, and he didn't have enough left in him, so he died. But Albert had to pay the price for an infant's life who never even made it to his first birthday, and had an entire life ahead of him, maybe sixty, seventy, eighty, or even ninety years and so on. All those years were ripped from Albert's lifespan and a cancer-causing force of death came on him. In other words, destiny decided to ensure both surviving Quinns died for the lives senselessly lost in the fire as penance and repayment for lost years and potential.
Laura got a big and beautiful house near the end of the series as a gift from a dying widow, who told her not to let hers and her late husband William's dream die out. In "The Last Farewell". Rather than let Nathan Lassiter take it over, she breaks out all the downstairs windows, then she and her husband fill it full of dynamite and Almanzo blows it to smithereens. That woman probably spun like a cyclotron in her grave. (Unless Laura felt that it would be better to eliminate the house than let seedy company workers invade it as boarders against the wishes of the widow- in which case, she performed a Mercy Kill.
It's possible the reason Reverend Alden got so much more upset than anyone else at the fact the townspeople decided to destroy Walnut Grove is because its founder, Lars Hanson, had died. He was there for its founding and outlived its creator, and hoped its citizens would be peace-loving men and women of Christ. Yet, here they were wiping out his dream and his legacy from the earth in an utterly hellish manner, thus the evidence he existed there and made a mark on the world, and he couldn't do a thing to stop them. When Alden said, "Today... we bury a friend", he really meant they were saying goodbye to Lars once and for all, something that never happened on the show proper beyond a thrown-in post-production epilogue because his actor died without warning.