Walken in particular makes an impression; so deadpan he’s almost horizontal. When faced with a shotgun and told to put em up, he simply responds with ‘no’, as though it is a ridiculous request.
Rockwell bounces between knowing it all and knowing nothing with enthusiasm whilst Farrell (and his eyebrows) take a generally calmer role, providing a backdrop to the craziness around him.
It does however sag in the middle, giving both the characters and the audience time to think of other things.
Maybe it being so hard to nail down is what makes it just ‘good’. Maybe it’s flitting nature is what makes it what it is and we should just accept it. Either way, if you’re after a quirky character piece with a smattering of blood this could be just the ticket.