The Nubian goats are noit yet there first import was 1896.
When Claire sets out walking (after drying her clothes on the beach), there's a quick shot of her feet. The boots she's wearing are modern. You can see a pull-tab for the zipper. The reason they have a zipper is that they are boots that Claire brought with her from the 1960s and not 1760s shoes.
Claire's gray hair comes and goes.