Yeah, I caught that too, re: Spacedock, and it seems to line up with offscreen sources, since the only thing I can even think of right off the top of my head concerning its construction history was in the FASA RPG, but other sources like Enterprise: The First Adventure and The Greater Good (from Mirror Universe: Shards and Shadows) have Earth Spacedock in service in both universes at least as far back as 2264.Given that closing shot, and given the generally fanciful visual effects this season, I think it's best not to take changes in visual detail too literally. This show is simply interpreting the look of certain things differently than previous shows did.
A couple of continuity details did strike me:
Georgiou mentions subjugating the Betazoids during her tenure. This is consistent with The Sorrows of Empire, which established that the Betazoids had been all but exterminated sometime prior to "Mirror, Mirror."
The opening shot of Earth showed that Earth Spacedock was under construction in 2257. I don't recall if any of the novels have specified when it was built. Anyway, we can confirm that it's different from the "Starbase 1" that was under Klingon occupation last week, although some tie-ins have used that name for Spacedock (which never really made sense to me, since a starbase is a support facility for deep-space operations, the equivalent of a frontier fort, while Earth Spacedock is more like an airport/hotel/mall complex in a major city).
Funny thing...I'm actually having esophagus-widening surgery on Tuesday (the day after tomorrow), which made me chuckle/shudder slightly at Tilly's line to Orion Clint Howard™ in tonight's episode.
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