The ideas I have for the Thalia and Nico memories might lend themselves to discussions. The Thalia memory would reveal stuff about Jason being abandoned as a baby and his mother being dead...as well as hints to his time with amnesia.

The Nico one...well they were talking about losing friends right? There's a nice conversation he has with Nico about that, which could prompt some discussion. Also the look on Sora's face when he finds out Hades' has kids too