The fact he's always going to know how she died, that is so very heartbreaking. And then how she's rather die than have her run with him erased. I'm not a big fan of the last Companion theory though, because there never should be a last Companion, just like there never should be a last Doctor.

I think the increase to three was because CAL had joined the other two kids.

They really should be more creative with Donna's wardrobe. There are other ways of dressing women with real bodies and I really miss the pantsuits. Although, I think she with this episode alone holds the record for the most costumes of any Companion of the new series. Freema had like, what, three costumes through the whole of series three?