I was surprised about Mr. C killing Richard but I always figured it was Bad Coop's son. I think he meant to extinguish him, but who knows if he's in the Black Lodge. I wanted Richard to suffer but this gave me mixed emotions. Like he and Diane were celebrating...
This makes me question where Audrey is. Her reality could be that she's at some mental hospital or something along those lines. Maybe she was taken by Mr. C and held captive for all those years, and maybe that's why hardly anyone mentions Audrey; perhaps they think she died at the bank. Perhaps that Charlie guy is her caretaker. It's all impossible to know, but if the next two parts are as good as this one, they should be able to give us more on the conclusion of part 16.
The Diane mystery is a big question mark to me. Maybe she's connected to Judy (could also be Sarah Palmer who is correlated to Judy). Perhaps Judy is the name of Diane's doppelganger who was put into the lodge after Mr. C raped her. Yep, that's a tough one.
Loved this part so much I'll probably watch it every night leading up to the finale. I just can't believe Agent Cooper is back!!! I couldn't help but smile