I think the Justice Society has finally arrived on Earth Primary! At least that's what it looked like to me at the end of the crossover.
Other observations:
-Ezra Miller's cameo was completely unexpected and surprising
-I loved seeing Beebo again
- How is Diggle's daughter Sarah alive again? And why is she 7 years old? Why is John Junior 4 or 5? Did the combining of earths somehow push the time line forward a few years?
-Where did Connor go?
-Since when does Superman have 2 kids in the Arrowverse?
- Most of all, what happened to William?! His fate is the only one we don't know about. Is he alive? Is he dead?
Overall I give the crossover event 2.5 out of 5 stars. This is my rating because I personally believe that it didn't live up to the hype. The only good part was the cameos. My favorite cameo was Wentworth Miller's.