I tend not to be very nitpick-y about practical details (whether she could make it to the tub in time, etc.), more so about plot holes (whether a given person would really act like that). That said, I was skeptical about the scene where they figured out where Dunn was holding Shaw hostage. It was like, "Techno-magic, go!"

But I was plenty impressed by the detailed profile and cunning of this villain, and the drama/humor thing worked decently well for me too. There were some really good scenes... it might have been one of my favorite episodes of the show.