The paraphrased line "you don't win wars by dying for your beliefs, but by making other bastards die for theirs" was said by General Patton in 'Patton (1970)'.
Luc mentions that God sent one of his angels to stop Satan from unleashing the Four Horsemen upon the earth. In the Bible, the Four Horsemen of the Apocalypse are actually unleashed by God as the final judgment of mankind.
The movie constantly references ravens--from the name of the town and tribe, to the casino name, to the Ravenfest party, to Jimmy outright quoting Edgar Allan Poe in the final scene. Ravens and crows are not the same thing.
At the Rav'n ball, Famine gets all padded up in baseball gear but moments later when he goes crazy and starts smashing a table with a baseball bat all the gear is missing.