1.) Mr. Mind's conveyance
2.) Taking Superman's frequent self-referential in-joke about once boasting that being inflicted with potent forces like lightning only tickled him, and weaponizing it to take out Superman.
3.) A Gardner Fox name-drop. I can't be certain, but I'm pretty sure the only reason writer Sholly Fisch included Batman villains The Terrible Trio (Fox, Shark and Vulture) was so he could make this joke. And honestly, that's as good a reason as any.