Urgh, the music dubbing was horrible. They should have been timing him at least so the bow movements were in sync. :/ And some of the editing really put me off as well - the continuity of some cuts were incorrectly timed to the point where it was noticeable. Did they change editor?

Apart from that and some minor gripes I have with Irene (which may or may not be resolved upon second viewing), and the editing issues, the episode was really, really good. The frozen field scene was probably my favourite - slightly trippy, but beautifully done. And it also appears that I ship Lestrade/Molly now.