Although "USS Callister: Into Infinity" takes place only a few weeks after the original "USS Callister" episode ended, in real life, almost seven years have passed for the actors involved. The season 7 episode does an admirable job covering up the signs of time, but there was one hiccup that prevents everything from feeling seamless: Michaela Coel, who played Nanette's coworker Shania, is missing. Her absence is notable given how sympathetic a character she was, and how she ended her original episode excited to start a new chapter in the game. She'd just escaped a fate that would've left her an ugly tentacle monster forever, and it would've been nice to see her enjoy her freedom going forward.

The reason for Shania's absence is simple: Michaela Coel is a much bigger name now than she was in 2017, so it was a lot harder for her and the show to get their schedules worked out.