A couple of the reveals were expected: Gemma = Ms. Casey and Helly = Eagan family, for example. But, other than suggesting that Lumon's goal is to sever and control pretty much everyone, we still don't know what the MDR employees are doing. For that matter, what are the goats for, and what's the meaning of the cards Burt and his people made? And what was the meaning of the mask dance Dylan watched after eating his waffles?
I knew from the outset Severance was going to be dark, but it took a couple of episodes to confirm the showrunners took that seriously. So many of the interior scenes outside Lumon are dimly lit. For example, Mark and Irv just seem to use under-cabinet lighting, and even Devon's house is subdued. I think this is a deliberate contrast to the stark bright white lighting at Lumon HQ.
I was a bit put off by Helly's chip implantation procedure, though. IIRC, it was done with her hair in place, which would be practically impossible to do aseptically. Interestingly, a neurosurgeon served (or should I say severed) as medical consultant and was in the scene. And Harmony Cobel didn't have any problem retrieving the intact implant drilling from the side. Artistic license, I suppose.