The Joker really did get his Glasgow Grin from his abusive father.
- The sheer rage Joker says the explanation with is real, but no one will ever know because he uses Multiple-Choice Past so often.
Each ferry had the detonator for their own bombs.
Not because the Joker cares about punishing the guilty or anything just because no matter who finally does it the other group will never escape suspicion. It also runs a very good chance that, had everything gone to plan, both could have gone up. And he does love to fuck with people. In this universe, Joker is ex-military.
- The Joker seems to have an uncanny ability to develop homemade bombs, and we also have the scene where Gordon gets "assassinated". The Joker was able to disguise himself as an honor guard, and perfectly replicate their every move. That's something that would often require month's worth of coordinated training. He's also rather capable of using various weapons. Additionally, he also makes a rather specific statement to Harvey at the hospital (the one about a truck of soldiers blowing up) almost like he's been through it personally.
