What else could he bring to the big showdown with Darhk? A machine gun, like all of Darhk's mercenaries were supposed to be carrying?

So, as I understand it, the world has 0 remaining nuclear weapons, since they were all launched and the rockets were deactivated in mid air? Was that what happened?

And they actually spoke out the moral of the season:
"Sometimes Justice requires killing!" Have nice summer, kids!

To be fair, I think every police officer in the city except Joe and the Captain are dead.

What if your parents adopt someone you're already dating? …or your parent marries the parent of someone you're already dating?

But they had tons of arcs that would have filled nicely the season. They just chose to solve all of them in a single episode. Or less. The metahuman invasion from Earth 2 could have potentially powered an entire season, and they ended it in a single cold open.

Even if that were so, (and I think he meant "1 lap by both of them together" produces 1 GW), Zoom was running in a loop. Wouldn't it be more effective for Barry to stay in one spot and try to catch Zoom any of the 500 times he runs by?.

I had never though about Barry's 4 grandparents all being dead by the time he was 11.

I don't think team-Flash is using any kind of scientifically-based nomenclature to name their Earths, but if Supergirl was originally in Earth 3, does that mean that Real-Jay was from Supergirl's Earth?

But even if he goes back to Earth 2, if the Reverse Flash got defeated, then Earth-1's Wells should still be alive, no? He seemed to be killed many years after Barry's mom, judging from his apparent age…

To be fair, the Arrow crossover showed that Barry is woefully bad at detecting projectiles coming from behind.

And they did the same thing for I don't even remember how many weeks:

Absolutely! Asking Sarah to give up on Laurel without even trying made Rip sound exactly like the Time Master Council from episode 1.

Rip: "We have to separate into teams of 2, to kill Savage in the three time periods at once."

If zauberbiests were an exception, Renard wouldn't have been cast out.

To be fair, Diana is more powerful than a zauberbiest…

A royal is kind of supernatural too, just a different kind of supernatural. At least, the other hexenbiest seemed to think so, when Adalind was pregnant with Diana.

Well, at least it's good news for the many, many pets we saw her help every week.
…oh wait.

I don't know; I think she's genuinely creepy.

To be fair, the only time she used a pin was when somebody got literally, physically pinned with a pointy metal object.