Some pretty good one liners in this episode, some in a fast and furious exchange so I missed a few first time round. It was also nice to see Ianto being a bit more action orientated and less tea-boy.
Ultimately, if you ignore the alien whale-sized plot holes, this was a cracking episode. However, it was obvious that Gwen wouldn't Retcon Rhys, but for the rest of the team to stand by while lovesick Jack allowed her insubordination was a bit odd.
Was it just me, or did it seem at the end as if the alien whale (whalien?) was communicating with Jack and Owen. I've seen messages where people said they cried at the end, which is an indication that either it was a moving end to the episode, or that some of the audience are far too emotional for their own good!
Oh, and I was having steak and chips whilst watching this, it didn't put me off my food, but then again, I've not found anything that will. Mind you, I might be more careful when buying meat from Cardiff!