1. Let’s start with the big reveal at the end, Morcerf (Fernand) sold Haydée’s father to the Turks to earn his fortune. That explains why the Count didn’t want Haydée to tell anyone who her father was in a previous chapter. It also means she isn't a random slave he felt like buying, she's a cog in his machine. It also looks like the count went over to the Baroness’s box just to test Haydée’s reaction. He claims that the particulars are unknown to him, but what are the odds? I also want to point out that she doesn't have any idea she's part of his revenge, just like Bertuccio doesn't know.
2. Apart from that, it was a fun little chapter with lots of comings and goings. I think it’s interesting that Dumas isn’t showing us every move the count makes, like what happened at the horse race. And we can also see that his eccentric behavior is starting to pay off since word is getting around and everyone wants to talk about him.
3. What did you think of Danglars’ daughter?

Did anything else stand out to you?

Last Line:

“Do you observe,” said the Countess G—— to Albert, who had returned to her side, “that man does nothing like other people; he listens most devoutly to the third act of Robert le Diable, and when the fourth begins, takes his departure.”