Les Yay: Severian speculates that this happened between Dorcas and Jolenta during his absence.
Moral Event Horizon: A rather ambiguous example, The nature of Severian having sex with Jolenta. It is highly questionable whether it was non-consensual or not— it might have been Severian's guilt about the rough nature of the sex — and she didn't really resist. Like the rest of the book, it's hard to know. The reader's reaction is how they read into the scene.
Rewatch Bonus: There are many hidden aspects of the story. Including:
Dorcas, Severian's second true love, is also his grandmother.
The tomb Severian spends much of his free time in as a child is his own. Hilarious in Hindsight because in one of the early chapters of the first book, Severian specifically notes that the funeral bronze on display in the tomb has similar facial features to his own.
For some, the appeal of the Urth cycle lies in trying to uncover the 'true story', to which the events of the plot, seen through Severian's extremely subjective gaze, allude.
Tear Jerker: You WILL feel sad when Terminus Est shatters during Severian's fight with Baldanders.