Fairly Rational
Banned
So Don cannot lie anymore ? The camera zoomed on his hand after he lied about his father, and it was trembling. I guess it was a way to show how Dick is trying to break out (?)
I think the hand tremor was supposed to signify a lot of things, and your idea of Dick Whitman trying to "break out" certainly fits.
I think Don caught himself in a lie and recognized how easy it would be to fall back into familiar patterns. Those patterns lead to excess and ruination, and he doesn't want that anymore. He's making a conscious decision to change. Part of that change is to be honest about who he is and where he comes from. You can see it on Don's face as he's explaining his real relationship with Hershey's (and it's a fucking amazing pitch in and of itself), that he knows he just sank the account. It didn't matter that he sank it, though. Either they would accept him for who he is or they wouldn't. By bearing himself like that, he's putting the ball in their court saying "this is me, this is what I do, either you want on or you don't."
I also think it's clear that Don is making a list of names. Names that will be brought to ruin on his coming day of reckoning.