Woah I'm glad the anime really flushed out the detail. The armored titan breaking the wall had me on the edge of my seat when I watched it for the first time.
For me, I'm frustrated with Tsukasa because she won't tell him what happened. It's not Nasa's fault that he can't remember, so just tell him. He's going through all this pain and for what? If he heard the truth before and still wanted to be with you, he won't have problems hearing it again.
I know this is a stretch but Alice's mother, Sharon, has a mole near her lips. In the flashback, there is no mole. I don't think it was Alice's mother that cursed the Duke.