Really liked the development on Thea and Laurel's part.
When I saw that water my first thought was "please, not slapping water again" but hey, boiling water was pretty creep. I do think Thea it's not really going back because of Oliver, I don't know, her thanks daddy and the "I don't care about hot coffe on my hand" were very suspicius.
Laurel's plot this episode to me seemed like the writers acknologing some mistakes and really doing the turning point for her character. I mean, she was at the AA meeting and made clear "I thought I was going to want to drink or take pills but I didn't'" (writers, ok, drug and alchoholic storyline erased), "I had my share of selfdefense classes", tries to beat up the guy gets beaten pretty bad, Oliver says she doesn't have the training Sara has she replies "I know, that's why I need to start" (writers, ok, gets training started). This way they separate her training storyline from Oliver (something some complained that she should been her own hero), by having the who killed Sara storyline she's connected to the main plot (last season was a lot of "her storyline has nothing to do with the main plot") and from now and then we'll be showed that she has been training hard to get there (a lot complained that she would be a kickass from a training during a mid season break). It does seem to be paying off as we see more posters who are leaning to the "she was not that bad/I kind liked her" diferent to last season where it was a lot less users.
Another thing that I noticed is a small development on Roy's Arsenal. They haven't called him that name yet, but if you noticed, the first episode he used the bow and arrow, the second episode on the Queen's office fight, he was using the sticks (I don't remember how to called, it's a small boo staff on each hand) and this episode he didn't shoot the arrow on the mission with Digle and Oliver, he ditched it and decided to go with hand to hand fight, I think they are showing some variety and not relying on him being great with the bow.
I am liking Felicity's interaction with Ray Palmer so far, want to see more where it goes as this gives Felicity something more to do than just being on the cave.