Crisis On Infinite Earths: 36 Easter Eggs, Cameos And References You Probably Missed
6. Swamp Thing
Yes, Oliver's closing monologue was the gift that just kept on giving as, following the Titans reveal in the beginning of the crossover, the-powers-that-be at the Arrowverse only went and found a way to incorporate DC Universe's dark and grim short-lived Swamp Thing series into the new multiverse.
An ever-so-brief dark shot of the titular creature stood out beautifully among all the brightness of the montage, while the fact that he's on Earth-19 is no doubt a reference to the fact that the show only aired in 2019. It does, however, beg the question: Is this the same Earth-19 that Gypsy and the Most Accelerated Man belonged to?