If two episodes equals continuity, then we have to consider those two blatantly Irish stereotypes, "Fair Haven" and "Spirit Folk", and I don't think anyone wants to even halfway consider them for anything.
Well, what else would you call it?
Continuity is when ideas follow through.
Contiguity is when ideas follow though directly from episode to episode next with out a 6 week interruption or a 3 year vacant spot where there's no clue that what happened before matters.
After season three of Buffy, the blurb in the "Previously on Buffy" recap lasted about 5 minutes every week, so that people could keep their shit straight. Apart from the two parters on Voyager, the only time (I recall that) they said previously on Voyager was in the one where Susperia showed up, just incase you had never seen the pilot.