We break down the parallel universes of "Star Trek: Discovery" Season 1, the twisty timelines of Season 2, and a fan theory that bust Season 3 wide open.
The Season Two episode, Star Trek: Discovery: Light and Shadows (2019) was directed by Marta Cunningham, who is the real life wife of James Frain, who plays Sarek in the show.
With Michael being the adoptive sister of Spock, the series have many flashbacks to their childhood and upbringing on Vulcan. Spock's Vulcan half-brother, Sybok, does not appear nor is mention during these scenes. In Star Trek V: The Final Frontier (1989), Spock says that he and Sybok grew up together. However, since it's never stated when Sybok joined Sarek's home - only that he did so following his mother's death - or when he was exiled from the family, it's not impossible Sybok moved in after Burnham, and left before she graduated (the two extremes of the flashbacks). Also, since Sybok was never mentioned before Star Trek V, it seems reasonable the family never spoke of him again after his estrangement.
The serif-font legends and subtitles in the "broadcast" episodes are absent from the DVD versions, where they are replaced with the standard DVD subtitles.