Third film collaboration between director Michaël R. Roskam and actor Matthias Schoenaerts, the previous were The One Thing to Do (2005) and Bullhead (2011).
When the waitress tells Bob he can't have a puppy in the diner she holds the glass coffee pot from the bottom. This would have made serious burns on her hand.
Bob: There are some sins that you commit that you can't come back from, you know, no matter how hard you try. You just can't. It's like the devil is waiting for your body to quit. Because he knows, he knows that he already owns your soul. And then I think maybe there's no devil. You die... and God, he says, Nah, nah you can't come in. You have to leave now. You have to leave and go away and you have to be alone. You have to be alone forever.
Bob: Yeah, Marv thought he was a tough guy. We had a crew once. Back in the day, when we was young, we made a little money but it was never, you know... So a mean crew rolls into town, and, you know... we flinched. That's it. End of the crew.
After Bob kills Eric Deeds, he looks at a broken mirror. He sees Eric Deeds face instead of his. There isn't a obvious answer to this question, but it is generally understanded that it means that Nadia sees Bob as the same monster that Eric was, which makes her frightened. It may also mean that so we can see who actually murdered Richie Whelan, after it was revealed that Bob did it.