The below Season 4 images were shared on Twitter. As you can see there is a dog in at least 2 of the 8 pictures. This is one of the Northern Inuit dogs portraying Rollo.
You can also see what appears to be a smaller water vessel which is likely one of the many boats from the book Drums of Autumn. However, in the last 4 images you can see a cabin and in 2 images there appears to be a fire going. There will be a famous fire in the books but I don't recall it happening this early (and I recall a lot) nor do I remember it being their cabin. So what this is I have no idea. Speculations abound but my fascination is just seeing Season 4 come together.
So that is definitely why Caitriona was cast because the chemistry is off the charts!
Outlander decided to do something that isn't really done on TV by doing the very first act of the episode without any dialogue. Toni Graphia remembers another show and network who wouldn't allow a dialogue free act and appreciates Starz for trusting them with the no dialogue and little voice over. I have heard not everyone loved this part of the episode but I loved it. It really conveyed the loneliness of being stranded on the island.
Claire also taught us the "Rule of 3" which kind of made me laugh because in the books there is this recurring theme of things happening in threes. But the "Rule of 3" is actually 3 minutes without oxygen, 3 days without water and 3 weeks without food.