User blog comment:Eobard95/Problems with Crisis on Earth-X/@comment-27700324-20180219190451

For Olicity. It is a common theme for the crossovers. Notice how the first crossover we had, there was barely any Olicity in the plot in Flash vs. Arrow, or Brave and the Bold. However we get to the Legends of Today/Yesterday and we end up having it be one of the central plotlines. Then in Invasion it is gone and it is back as of this one. However i feel the Earth-X one at least had one good relationship for Oliver in the form of Kara. Supergirl has also had a lot of love life problems. A heavily rushed one in the first season of the show. A terrible one in Season 2 and a couple of stalkers from the cosmos. So really i feel Oliver and Kara are kinda perfect for each other at this point. Their dynamic on both Earth-X and Earth One is amazingly filled with chemistry.

Other than that. The other plot holes are the same reason Jay Garrick and the others didn't help last crossover. They are either too busy or they don't care about another Earth's problems. (For Jay it was probably because they forgot to send an invite) Only one i can see caring about how Barry Allen's wedding is going to turn out on Earth Thirty Eight is James Olsen who despite being jealous of the guy, still respected him in the end. Same with Winn who is a good friend. So it is more who was invited to this wedding who really know of this Nazi threat. Multiverse scenario is just a plot hole to add onto a whole bunch of plotholes. Which you are going to find in a TV show. Especialy multiple TV shows together in one.