I know Eric Roberts will be back as Mr. Thompson but is his son going to be in this episode as well?

who is "Mr. Thompson"?

Nah. I think Thompson jr will remain in the GN.

I think your right but it would be cool if they brought him to the show.

I wish they had brought him in, as something of a partner to his father - having him pursuing Flint or something. Just so that people who follow the graphic novels could be happily awed.

Can ANYONE please explain to me why Thompson let Meredith go free??

I think that he pitied her because he knew that the company was hiding Claire from her, and he had his one act of mercy.