This one got a bit confusing about what was real and what was Oliver's hallucination. I think we're supposed to take everything without Ollie in it as real, but then it's kind of a coincidence that Hallucin-Emiko said "I know about your baby" shortly after Presumably Real Emiko learned about it from Felicity. Obviously a fake-out for the audience, but a contrivance in-story.
I was kind of wondering if Tommy might turn out to be more than a hallucination. Given the fantasy/supernatural elements that are now an established reality in the Arrowverse, he could've easily been a real ghost. Or he could've been some manifestation of the Monitor, tying in to the mysterious deal he and Oliver made. I knew that was unlikely, since this show prefers to stay in its own relatively grounded lane except during the crossovers. But it brought Sara back from the dead, spent a whole season with an evil sorceror villain, and spent a lot of time focusing on Laurel From a Parallel Reality, so you never know.
In the future, Galaxy One's Zeta enforcer robots are clearly an homage to Zeta from the DC Animated Universe's future-based shows
Batman Beyond and
The Zeta Project. But only a loose homage; that Zeta was a holographically shapeshifting assassin android prototype who developed a conscience and went rogue rather than become a killer (rehashing the plot of the episode "Alpha" from the 1990
The Flash), while these are just mass-produced soldier drones.
It was surprising to see Future Alena with short hair. It didn't seem possible to pack 2019 Alena's long, lush hair under such a short, tight wig, so I realized it had to be 2019 Alena who was wearing the wig. I looked into it, and apparently Kacey Rohl recently shot an upcoming film called
Baldy in which she plays a woman pretending to be a cancer patient, and she shaved her head completely for the role. Which is a shame, given how gorgeous her super-long hair was.
It's interesting that it's been revealed in the future that Alena steals Archer, but we haven't seen it in the present yet. I mean, it was telegraphed pretty clearly a couple of weeks ago, but it hasn't happened yet in the present, or at least hasn't been discovered yet. But then, the future sequences have foreshadowed (or hindshadowed?) a number of things before they happened, like vigilantes becoming outlaws again, Felicity going into seclusion to raise her baby, etc. (Ooh, and it was Alena's idea for her to go into seclusion -- the better to steal Archer?)