We already knew that the DCU's upcoming Clayface will have (background) nods to baddies The Penguin and the Joker, but now an eagle-eyed fan has spotted another Batman-related Easter egg that links to one of the Dark Knight's greatest allies.
In a new photo first posted to Twitter by @Chimichangaprod, you can see a poster for 'The Flying Graysons', which any self-respecting comic book nerd will know is a reference to husband-and-wife trapeze artists John and Mary and their son Dick. In the source material, Dick was adopted by Bruce Wayne when his parents were murdered by a mobster – and ultimately went on to become Batman's sidekick Robin.
