Given the language spoken, as well as the region, the Indians are Sioux.
The porcelain doll that Laura gave to the Indian girl,is the same doll in Nelliie s room in the episode Bunny.
Charles traded rigs to an older man who had a big hearing aid earpiece. In the 1800s, it became more common for for these ear trumpets to made from metals like copper and brass..
In the episode "The Raccoon", Laura's doll was called Janet. It's head was accidentally broken & Mary priced a replacement head but couldn't purchase it. In this episode, the doll is called Sally.