LOTS of references in this one. Here's a few I caught:

- Billy Wintergreen - was a partner/person who trained Slade Wilson in the comics. His comics self wasn't quite so bad-@$$, though.
- Slade's son, Joe - That would be Jericho of the Teen Titans. Slade has two other children - Grant and Rose.
- Yao Fei's daughter - I didn't catch that on my first watch. That would be Shado. Yes, from the Longbow Hunters.

Did anyone catch any more?