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I love the reference to Metebilis 3. In the 1990's spin-off Shakedown: Return of the Sontarans, for licencing reasons there could be no mention of the Doctor or Tardis at all, though they did slip in a reference to Metebelis 3 to please the fans.
Now we have Metebilis 3 being mentioned again in a spin-off, this time mentioned at the exact moment the Tardis can be heard materialising, signalling the Doctor's arrival into his very first ever appearance into a spin-off in the shows 46 year history. I think it's all fantastic!