The Accountant's silver coin is one of the 30 Denarii given to JudasIt would certainly make enough sense given what he does for a living.
Piper is Mandy Lane
- After the events of the film, Mandy changed her name, adopted an accent and began to work around the south as a waitress. She also toughen up and learnt about cars.
The Devil let Milton take the Godkiller
- It fits everything we're told in the film: The Devil is a decent guy, who hates all those cults worshiping him and doing all sorts of fucked up things in his name. The Accountant seems to think it's virtually impossible to steal the Godkiller. Milton says he just walked in and took it, which could be true because the Devil did nothing to prevent him. The one thing that clashes is why the Devil then sent the Accountant after him? It could be that the Devil has to follow the rules, which say someone has to be sent to hunt down an escapee immediately.
- It could also be that he wants Milton to put an end to the cult, but can't just let him walk free, so he let Milton take the gun and gave him enough of a head start to finish the job before being dragged back to hell.
God is dead.
- God is never mentioned, and when we first see the Godkiller, it is missing one round, meaning that it has already been used at least once. Also, unless it was made to take out members of some non-Christian pantheons, the name implies it only ever had one purpose...
Demons/The Damned are Sin Incarnate
- Milton doesn't really do anything that one might call flirting, let alone anything you might call sex, and yet is irresistible to two supporting female characters, and obviously the best sex the latter has ever had. It's possible that demons/the damned inflame the lust of others, and Milton's high-grade ass kickery might be the result of being wrath incarnate. The copious sugar in coffee might be a quirk of Milton, or it might be a reflection of gluttony.