I posted about this the other day, but I was on my phone, so I couldn't talk about it in detail: Does anyone get the idea that this episode was one of the two added to the show after the intial order of 13 episodes?
My reasoning is basically as follows. They would not add two episodes on to the end of the season, because that would result in a very anticlimactic ending. So they would have to find somewhere to sandwich two episodes in the middle of the already plotted arc. This episode does call back to earlier continuity, but judging by the trailer for next week, it's sort of awkwardly jammed in the middle of the "Cornwell mini-arc." It also wrapped up things very well, to the point of almost being a self-contained episode. The only possible exception is the burgeoning relationship between Burnham and Ash Tyler, but since they don't actually remember their conversation in the iteration where they kissed, and Burnham made it clear she wanted to "go slow" they could go right back to acting professional for several episodes.
I guess we'll see in the longer run if anything which took place in this episode is referenced anywhere else. If it happens in a single episode, it could always be chalked up to that episode being a mid-arc insertion as well. But if there are multiple references we could conclude that this may indeed have been a story inserted into the arc late in production.