Lots of surprises in this good episode.
That was really cool to see Mike return, and it was done in a cool way, too.
When Coulson said that he had backup on the way, I figured it was Melinda May, and that we just had not seen her break out yet. Then when he said it was one person, I KNEW it was her, but thought that we really really should have seen her break out by now. Obviously wrong! Nice surprise seeing Mike there, didn't expect that at all. I liked the way they did the reveal, too.
When Skye's Mom and Gordon visited Cal, the room (and his behavior) looked like Cal had been making some efforts at self-control, presumably with the long game (see Skye) in mind.
If I was with Coulson's SHIELD, I wouldn't trust Mac or Bobbie, forget them. But, I'm not with Coulson's or the other SHIELD, and I will just return yet again to my same old desk tomorrow, looking forward to the next episode...