1. The Dalek saying to The Doctor, "You are a good Dalek," which is an obvious callback to "You would make a good Dalek" from Eccleston's Dalek, as was the setup of a captive Dalek powered down, in need of help, and getting back to causing mayhem when it's healed. There are so many parallels here, as there were with Girl in the Fireplace in Deep Breath, that I think they must be deliberate, rather than just running out of ideas. Why does he keep encountering things he has seen and done before, and why can't he recognize the parallels when we can? Also, to have moved from "would make" to "are" is not exactly something this Doctor can be at all proud of; will he get to/need to explore the consequences?

2. A Dalek's mixture of technology and biology has been hinted at before, but never before explored in so much detail. I like this, especially the disquieting idea that the biological part needs to feed, and does so on humans from time to time, thus giving it a biological imperative above and beyond genetically engineered psychotic rage. More of this would have been very interesting indeed.

3. The "rebels" had grenades that resemble very closely the bombs strapped to the (essentially) "Kamikaze" Daleks from Destiny of the Daleks, only smaller. Was this coincidence, a subtle reference, or something else?

4. The "resistance is futile" quotes (as opposed to the more common for DW "resistance is useless"), combined with The Doctor's attempt to turn the Dalek and release it amongst its own kind to make them all good seem very, very clear references to the Hugh storyline from ST:TNG. Why here? Why now? I'm not suggesting a deliberate crossover, though that did happen in officially-licensed comics with 11 and the TNG crew. But it does make me wonder whether they wanted to suggest the parallel even more strongly only to rework it, particularly given what I've read was in that deleted scene.

there was an extra who looked almost exactly like Maxtible from Evil of the Daleks, which was of course also set in the Victorian era. He'd been spotted in on-location photos, but people didn't think he was in that episode and therefore would have to be in another. But he was there, if you look closely. Others have pointed out that another one of the clockworks was dressed as a redcoat, which they suggest may refer to The Celestial Toymaker or another story (Highlanders, maybe, or the not-missing War Games?).

the Chinese clockwork, since Talons of Weng-Chiang is also Victorian and features 51st-century technology. Just seemed like another parallel that the Doctor couldn't recognize, but we could, rather than a missing episodes reference.

Clara - "I'm his carer"
The Doctor - "Yeah, my carer. She cares so I don't have to"

...and when he told Blue that crying was how civilians usually communicated with Soldiers. It was powerful and hilarious at the same time.

I liked the new teacher dude a lot. A good performance and a character with some hidden depths, nice. The missy character is already grating on me though. Do we really need to stop the episode to have a small scene further setting her up?

Also yes, yes, yes! It wasn't just for the timewar. The stupid plastic, multi-colured fat toy Daleks are no more, wooh!