There's a cameo by Nightwing, atop the bridge as Black Canary and Huntress enter his city of Bludhaven.
The two Meta-Brawlers at the beginning of the episode are Hellhound and Shatterfist.
Two of the voice actors, Morena Baccerin and Gina Torres, were in the television series "Firefly" together.
When The Question opens the container in the freezer, he says, "32 flavors." This is a reference to the 31 flavors slogan of ice cream chain Baskin-Robbins.
Amy Acker and Gina Torres were both in the Buffy the Vampire Slayer spin-off Angel.