Arrowverse: Every Major Easter Egg, Clue & Reference To 'Crisis On Infinite Earths'

During the Elseworlds crossover, Superman managed to read the Book of Destiny and discovered that both Barry and Kara would ultimately die trying to save the world from Deegan's new reality - combusting due to the speed they move at when trying to slow down the Earth's rotation.

This was a significant Easter Egg because both The Flash and Supergirl are major fatalities in Crisis On Infinite Earths - with the Girl of Steel falling after a vicious fight with the Anti-Monitor and the Scarlet Speedster suffering a similar fate to the one that almost befell his TV counterpart, as he raced to save the Earth from the Anti-Monitor's anti-matter canon.

What's interesting about Elseworlds is that Oliver seemed to change their destinies after a conversation with The Monitor. While they could always end up perishing in next year's Crisis crossover, it's possible that he may have exchanged his own life for theirs. But if this were the case, would The Flash still vanish (like the newspapers state)? Time will tell.