I disliked Elena telling Sophie the nightmare wouldn't come back because of my honesty issues (Don't make promises you can't keep.). I'm very curious as to what said nightmare is, though. Isn't it natural that as a parent in that situation you ask?
I also dislike when the agents break the rules. First Viv pulling that "We found Sophie's body "thing (Is lying like that even legal in her capacity?) and then Elena ambushing the guy in his car with a gun -- and Jack running with it, though I was relieved that he was just doing it to cover her ass (and he's badass enough that the guy wasn't going to call his bluff -- "We'll have Agent Delgado walk you to your car." // "Yeah, if these were an episode of Matlock I'd give a crap.").
I liked the resolution of the Carlos-Elena thing. (Also interesting that earlier in the investigation Jack matter-of-factly references Elena&Danny's involvement.)