I'll put my comments in spoilers for those who haven't seen it

Click to reveal..
a lot of loose ends left going into next season.

Capone now in control as torio retires. It's interesting to see eli picked up by van alden because they know each other, that'll be fun.

Chalky gonna be on the warpath after harrow fucked up. I wasn't surprised he hesitated but I didn't see that coming.

what's to become of willie thompson now, is he staying with nuck or going back to school?

marget moves into her rothstein rented apartment, I imagine that will come up next year.

Not much of the mob in the show this year even though lansky and luciano made an important leap in the tampa deal. I imagine as the show moves into the late 20's we're going to get more focus on those gangsters.