(SPOILERS) One thing that doesn't make sense...
So the father catches Simon Pegg doing just about the worst thing someone can do to your wife. He punches Pegg, hauls him up and... takes him for a drive? What? Like, seriously, where the hell was he going? Why not just call the police?
They make it a big point that he only locked Pegg in the dungeon *because* Pegg snapped the student's neck and would have tried to blackmail him. He felt he had no choice.
But if he wasn't driving Pegg to the dungeon to begin with, seriously, where to? You don't drive the criminal to the police department -- you call the police!