The idea for the dream came late in the writing process. In part it was a callback to Jamie's nightmares in Season Two.
The title of is taken from the last line of a poem called 'The Lake Isle of Innisfree' by William Butler Yeats, which is quoted in the book Drums of Autumn.
This is a real creation story of the Mohawk people. The First Nations actors had to memorize all of their Mohawk dialogue phonetically as none of them were actually speakers of the Mohawk language. Not an easy task.
To give Caleb two severed fingers, the production team fitted the actor with green 'finger gloves' that could later be removed using C.G.I.
The burger place that Claire mentions, Carmi's, is a nod to STARZ president of programming, Carmi Zlotnik.