Oh and a blink and you miss it Movellans moment.
This is my second biggest complaint about NuWho (the first being Moffat and his inability to
actually kill someone - I mean, fer Christ's sake, the guy would have brought Adric back after a couple of episodes). We get too many of these "Hey, we're going to bring back (character/villain/ally) from the classic series for all of you viewers who are mature enough to watch those episodes", only to have them pop up for a hot minute, or to be utilized in a way that is completely different from their original incarnations (Macra, anybody?). When I heard the Movellans would be back, I was genuinely thrilled. And while it was cool to see them in the episode, it was the television version of clickbait. If you're going to bring them back, bring them back. You have no problem with overusing the Daleks or Cybermen, so why not the Black and White Guardians? The Movellans? Alpha Centari? Turlough?
Wait, not that last one. Let it be stricken from the records.