When trapped in "Clash of the Planets." Cyborg says, "I remember this scene. We're in the first episode of season four." This episode is the first episode of Season 4 of Teen Titans.
Control Freak's mug shot shows the number "257-325" - which is the production number of Fear Itself (2004), where Control Freak made his first appearance.
The episode title "Episode 257-494" refers to the actual production number for the episode.
The production number 257 is referenced again with "Agent 257."
The TV chef show appears again. It was also seen in Nevermore (2003), Fractured (2004), and The Beast Within (2004).