On the board Beast Boy uses to a blackboard to show his multiple theories about Red X's identity, there are several drawings of Robin, including:
. "Evil Twin" - Robin and Nibor (Robin backwards, a subtle reference to Fractured (2004))
. "Part of a clone army"
. "Interdimensional Imp" (Larry the Titan from Fractured (2004) unmasking as Red X)
. "Time Travelling" with image of Nightwing from How Long Is Forever? (2004)
. "Long Lost Brother" with a Robin image that bears a passing resemblance to Robin's voice actor, Scott Menville
. "Jason Todd" [the second comic book Robin]
. "Bionic Monkey"
The design and role of character Professor Chang, portrayed by actor James Hong, is a reference to the character of Hannibal Chew from the original Blade Runner (1982) - also portrayed by James Hong. Both characters are encountered alone in a freezing/cold location, both wear a specialized outfit to protect them from the cold environment, and both are pressed for information to move the story forward.