The episodes Beyond the Aquila Rift (2019) and Zima Blue (2019) are from a book called "Zima Blue and Other Stories" by Alastair Reynolds.
Netflix explained on Twitter they are experimenting with the episode order of the first season by presenting four different episode orders to different viewers.
There is a reoccurring theme of broken or damaged left arms throughout the first season.
At the beginning of each episode, the three-sign logo of the series changes into signs that hint at the story in the episode.