There's a bunch of nods in the episode, such as a scene where General Stewart is tied to a chair and Diggle tells him that he "can't will his way out of those ropes", or a bunch of times where Diggle conveniently stays in front of a green light, etc. Like I said, I'm no fan of this kind of tropes in superhero shows when they develop an original character for many seasons and then suddenly decide to retcon the character into an established hero from the comics, because I feel it's a poor form of storytelling, but who knows, it could actually be done well here.