When Crunch tells Nicky that Francie is his apprentice Nicky makes a comment about Crunch being a wizard. Jay Baruchel who plays Francie stared as a magical apprentice in The Sorcerer's Apprentice (2010).
When Sunny is pointing the flintlock pistol at Crunch it is not ready to fire because the Frizzen should be in the down position to hold the priming gunpowder.
In the nocturnal aerial shot of Niagara Falls the river is glowing in the wrong direction. The Canadian city shown is in the left bank of the river, not on the right back, as shown.
Francie Tobin: Interpol? Fucking Interpol? I'm not going to fucking prison! I'm not cut out for that shit. Have you seen these fucking arms, man? These wet noodles will prevent very few prison rapes.