Huh, never noticed before in Yesterday's Enterprise that Castillo actually taps his movie-era
command badge at one point to talk to someone.
I wonder if that was just another continuity error (of which there are many in this episode), or if we're meant to think Starfleet really did switch to communicator badges during the Enterprise-C era.
And while I never gave it much thought before, I have to agree with Moore in the commentary that this episode REALLY deserved to be a two-parter. There's just so many great side-stories and interesting avenues they could have gone down with these alternate characters, and it's a shame we never got to see them.