Officially, RD takes place in a universe that's parallel to the ones in CC. (Parallel universes are the main aspect of CC's story.) So, you can still say it happened, even though it has no bearing on the events that take place in CC. There are numerous RD references throughout the game.
  • Serge is around, but instead of being the narrator, he now says nothing at all. Quite the turnaround, there.
  • Kid is in the game and is probably the character who most resembles her RD self. She's still a member of the Radical Dreamers gang of thieves, but she's actually...the only member. Heh. Basically, she spreads rumors about the notorious Radical Dreamers so that people will freak when she tells them she's a member.
  • Magil, who is really Magus, was set to appear, but as time went on in the game's development, they couldn't find a way to fit him into the story in a significant way, so they did away with it. So instead, you have a character that looks, moves, and fights just like Magil/Magus...but it's not actually him.
  • Lynx and the Frozen Flame figure largely in the plot.
  • Miss Riddel and Viper Mansion.
  • The Elranzer sword.
  • There's a location in the game where you can read the prologue from RD. This is where it's implied that RD is going on in an alternate universe.
  • Several of the game's songs are directly based on RD songs.