(at around 56 mins) 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.
(at around 12 mins) When Lilly and Jimmy are behind trailer talking and kissing, the positions of their arms change several times between shots.
(at around 5 mins) When Luc/Death is working on the road crew, his ankles are shackled. Right after Lola shoots through the chain connecting his wrists, his ankle shackles disappear.
(at around 2 mins) When Pestilence pulls up in the mining area, his window is open and his elbow hanging out. The next shot of his car, a few seconds later, shows the window shut.
When Jimmy shoots himself in the chest, the revolver is angled down so that the bullet would exit somewhere around his kidneys. But the squib in the back of his jacket goes off somewhere near his shoulder blades.
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 around 1h 19 mins) Tanner, a sheriff, allows the man and woman who brutally murdered his sister to just walk away near the end of the movie.