Look closely at the Wilder "family tree" posted on the blackboard by Miss Wilder in the opening scene. The name of her and Almanzo's younger brother is misspelled. It's supposed to be Perley, not Parley.
In the flashback scenes, when Albert is portrayed suffering at the hands of his abuser at the orphanage, he looks exactly the same as he does at the present, and much older than he was when the Ingalls first met him and took him back to Walnut Grove. This was unavoidable due to production order, but it's still worth pointing out. They could have at least tried to make Albert look a bit younger.
When Albert wakes up yelling from his nightmare, his face is an absolute pool of sweat. However, seconds later, when Charles comes up, Albert is not nearly as sweaty.
Harriet: (laughing to Nels as she gestures to their new toilet) As I'm sitting here, I shall feel like Queen Victoria!
Nellie: (holds up a skinny little twig from a tree branch) This is about as much of a family tree as you've got, Albert! (smiles and walks away) Laura: (to Albert) Don't you pay her any mind. She'll never change. She's just talking her usual nonsense.
Nellie Oleson: Willie told me all about your class project. How's yours coming? Laura: I haven't started it yet. Nellie Oleson: I see. It must be very hard tracing all your relatives' names and everything, having to spend all that time in the forest or wherever it is you're from. Laura: It's called the Big Woods, and I'll manage, thank you.
Nellie: You know, the Oleson family goes all the way back to royalty. We had heads of state and titles for most of my relatives. Laura: You mean like Nero and Ivan the Terrible? Nellie: I'll ignore that.
Lucy Lee Flippin and Dean Butler were credited as townsfolk from this episode onwards.
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