I don't know. Not really a bad episode, but not really all that great either. I would have been more surprised if Clara or the New Mexico deputy weren't Zygons. Still, at least we didn't dwell on death this week, for the first time all season.
So if Osgood's Zygon duplicate continued on impersonating her to the point they essentially became a dual entity, what about the Zygons impersonating Kate and the other scientist in Day of the Doctor? Did they just decide, "to hell with this let's be ourselves?" And if so, why weren't they as attached to their counterparts as the Osgood Zygon was?
And now Zygons can pluck an image out of someone's head and impersonate that person? Good thing the Doctor didn't face off against them as they'd likely impersonate someone who couldn't possibly be on hand and therefore ending the whole charade. Hell, for that matter, does the Zygon meeting with Kate take on the form of a deputy because we can't possibly have the Brigadier there?
Although, on the issue of Zygon telepathic assistance, just what is the range? The one operating the UAV at the UNIT tent was nowhere near the ones pretending to be her family, yet they still pulled off the disguise.
So, meanwhile, Osgood is a last name, it's getting silly they aren't giving her a first name, to the extent that apparently the headstone only reads "My Sister."
Really, the jokes about UNIT dating are exhausted. Oh, I get it, UNIT dating is an amusing continuity problem from the classic era, and while I laughed when it was referenced in The Poison Sky and even chuckled at the line about date protocols in Day of the Doctor, it's getting wearisome hearing "in the 70s or 80s" every time the Pertwee or early Baker UNIT stories are mentioned. The joke's been told, movie on.
It seems the Doctor's hatred of soldiers has been removed as abruptly as it was added. We saw this earlier in the season with the Lake Base story where despite the fact those characters were military the Doctor got along fine with them, he likewise doesn't seem to have much problem with the UNIT soldiers here. Sure, he doesn't seem to care for the Colonel much it seems more as a result of not liking her personally than because she's a soldier. Don't get me wrong, I didn't care for the soldier hatred last year, but removing it so suddenly is just as bad.
So if UNIT has Osgood's inhaler, what's Osgood doing when she has asthma attacks? Being held captive by shapeshifting aliens is stressful, and even if this is the Zygon she still needs the inhaler as much as the original does.
Finally, why is there a picture of William Hartnell at the UNIT safe house?