Superman Returns
Brandon Routh is playing Kingdom Come Superman. Things got dark after Superman Returns, huh? Wonder what happened to that kid of his... (nah, CW ain't that dark).
66niverse
The Justice League is around in Legends of the Superheroes, yet Wonder Woman suggests making "a League of their own" in Batman 66 meets Wonder Woman 77. This wouldn't be a problem if Robin wasn't in Legends of the Superheroes, since he was Nightwing in that comic. It's possible the comics will end up non-canon and Wonder Woman will be from another earth, but currently thats not the case, so it's best to find a solution.
Either:
1. Dick Grayson returned to his Robin persona.
2. Diana Prince didn't know of the Justice League.