This is the first time we see Roger clean-shaven, which was important as beards were not very common in the 1700s.
Brianna sings the song 'San Francisco', a big hit in the 60s. It was performed by a McKenzie: Scott McKenzie.
The ship interiors are the same used for season 3. They were shipped in from South Africa.
The title was chosen as a reference to Alice in Wonderland. It's a good way to characterize Brianna's experience of going back in time.