I loved how they introduced more of Mike. I've enjoyed this season so far but I personally felt an extra kick of energy when Jimmy and Mike had a more in depth scene of them kind of working together.
The opening flashback does explain why Jimmy is so loyal to Chuck and everything, but I thought it went on too long, and I'm still not as interested in this particular story, compared to the rest.
If Jimmy hadn't warned the Kettlemens, Nacho could have really scored. That was a lot of cash. One more thing to eat away at Jimmy being a good guy.