Footage from the original pilot is used during the Ingalls' trek to Winoka as you can clearly see Jack the dog following the wagon.
Footage of Charles attempting to fix the wagon wheel during the Ingalls' trek to Winoka is reused footage from the episode "I Remember, I Remember."
Baby Grace rolls onto her stomach on the bed, then when Laura picks her up the baby is on her back again.
Charles tells Caroline when they drive into Winoka that he's never seen so many people before, yet early in the previous season Charles had visited Chicago.