As opposed to placing large monoliths, Native Americans often built cairns made of stones stacked around 4-5 feet high, which were the inspiration for this stone circle. The center stone was intentionally kept as a monolith as an homage to Scotland and the stones at Craigh Na Dun.
A stunt dog had to be brought in for the boat scene with Rollo as Dui (pronounced like Dewey) was too gentle and wouldn't snarl and jump on the attackers.
Regulators, found in the back country of the Carolinas during the mid-to-late 1700s, were citizens who took up arms against colonial officials, sheriffs, tax collectors, etc. whom they believed were taxing them unfairly.
This Gaelic lament was written and composed by Robert Robertson. Luckily for Jamie, who lacks any musical talent, it's more important to sing a lament loudly than in tune.
The use of the song 'America the Beautiful' was planned before the script for this episode was written. Dialogue was written purposefully but without the intention of being heard, and the song is meant to be a strong contrast to the darker side of colonial America that Jamie and Claire are experiencing.